Un‐cards, Playtest Cards, and Other Funny Cards

Non-legal "funny" cards are considered low priority for implementation in Forge. Many of them require an immense amount of work to support mechanics that only appear on one or two cards. Others are impossible to add without expanding the scope of Forge beyond that of a rules simulator. That said, Forge does support some of these cards, and new ones are implemented on a "whenever someone gets around to doing it" basis.

Below is a list of all "Funny" cards, organized by estimated viability of implementing them in Forge, and roughly grouped by mechanic.

Disclaimer:

This is not intended as a to-do list, as an indication of how soon these cards will be implemented, as an indication of whether they will ever be implemented, as a thorough assessment of implementation difficulty, as a comprehensive list of complications that may emerge when attempting to implement these cards, nor as indicative of the maintenance costs associated with adding such edge cases to the project's code-base.

Comparisons between mechanics needed to support these cards and existing mechanics are not indicative of simplicity. Cards within tiers are loosely grouped by mechanic as a reference, so that implementations designed for one might be made flexible enough to account for others.

The tiers below are not indicative of the amount of overall work needed to implement the cards or features within. They are a broader assessment of how the mechanics and spirit of the card are suited to Forge, to a rules engine, and to a digital environment altogether.

Potential alterations to keep the spirit of the card are considered, and the position of the card may be adjusted accordingly. For example, Infernal Spawn of Evil has the player say "It's coming!" as a flavorful addition to a cost, and is placed in tier 2 because the card mostly maintains its spirit without the spoken dialog. Toy Boat has the player repeatedly say the words "Toy Boat" quickly as a tongue twister, and is placed down in Tier 6 because removing spoken dialog defeats the purpose of the card.

This page is subject to updates as challenges to implementing these cards are discovered or resolved.

Cards prefixed with (P) are playtest cards. Cards prefixed with (Uk) were exclusive to Unknown Events.

Tier 0: Done

The Cheese Stands Alone
Chicken a la King
Clambassadors
Denied
Fowl Play
Free-for-All
Jumbo Imp
Organ Harvest
Poultrygeist
Temp of the Damned
Chicken Egg
Goblin Bowling Team
Goblin Tutor
Krazy Kow
Spark Fiend
Strategy, Schmategy
Elvish Impersonators
Flock of Rabid Sheep
Growth Spurt
Hungry Hungry Heifer
Incoming!
Mine, Mine, Mine!
Timmy, Power Gamer
Jack-in-the-Mox
Paper Tiger
Rock Lobster
Scissors Lizard
AWOL
Johnny, Combo Player
Mise
Topsy Turvy
Blast from the Past
Face to Face
Goblin Secret Agent
Form of the Squirrel
Old Fogey
Uktabi Kong
Mana Screw
Amateur Auteur
Crow Storm
Novellamental
Time Out
Inhumaniac
Box of Free-Range Goblins
Hammer Helper
Hammer Jammer
Painiac
Target Minotaur
As Luck Would Have It
Beast in Show
Chittering Doom
Ground Pounder
Hydradoodle
Willing Test Subject
Buzzing Whack-a-Doodle
Curious Killbot
Delighted Killbot
Despondent Killbot
Enraged Killbot
Lobe Lobber
Mad Science Fair Project
Steel Squirrel
Killer Cosplay
(P) Banding Sliver
(P) Frontier Explorer
(P) Imaginary Friends
(P) Sarah's Wings
(P) Scaled Destruction
(P) Wizened Arbiter
(P) Command the Chaff
(P) Control Win Condition
(P) Enchantmentize
(P) Khod, Etlan Shiis Envoy
(P) Recycla-bird
(P) The Grand Tour
(P) Celestine Cave Witch
(P) Chimney Goyf
(P) Corrupted Key
(P) Frogkin Kidnapper
(P) Largepox
(P) One With Death
(P) Underdark Beholder
(P) Xyru Specter
(P) Yawgmoth's Testament
(P) Impatient Iguana
(P) Tibalt the Chaotic
(P) Domesticated Mammoth
(P) Frenemy of the Guildpact
(P) Generated Horizons
(P) Growth Charm
(P) Krosan Adaptation
(P) Plane-Merge Elf
(P) Vazal, the Compleat
(P) Evil Boros Charm
(P) Golgari Death Swarm
(P) Graveyard Dig
(P) How to Keep an Izzet Mage Busy
(P) Personal Decoy
(P) Sliv-Mizzet, Hivemind
(P) Wrath of Sod
(P) Lantern of Undersight
(P) Mirrored Lotus
(P) Puresteel Angel
(P) Unicycle
(P) Aggressive Crag
(P) Domesticated Watercourse
(P) Enchanted Prairie
(P) Jasconian Isle
(P) Noxious Bayou
(P) Taiga Stadium
(P) Waste Land
Fruitcake Elemental
Season's Beatings
Andrios, Roaming Explorer
Arteeoh, Dread Scavenger
Chandra, Gremlin Wrangler
Diabolical Salvation
Discord, Lord of Disharmony
Dungeon Master
Euroakus
Inzerva, Master of Insights
Kharis & the Beholder
M'Odo, the Gnarled Oracle
Nira, Hellkite Duelist
The Cinematic Phoenix
The Legend of Arena
Fabled Path of Searo Point
(P) Slumbering Waterways
(P) Temur Elevator
(P) Under-Construction Skyscraper
(P) Wrenn and One
(P) New Master of Arms
(P) Teferi, Druid of Argoth
(P) Wisedrafter's Will
(P) (Uk) Mox Poison
(Uk) Incisor Steed
(Uk) Life Cloud
(Uk) More of That Strange Oil...
(Uk) Phyrexian Broodstar
(Uk) Nim Mongoose
(Uk) Phyrexian Chimney Imp
(Uk) Red Priest of Yawgmoth
(Uk) Bringer of Green Zenith's Twilight
(Uk) Locus Cobra
(Uk) Then, Dreadmaws Ate Everyone
(Uk) Forestfolk
(Uk) Phyrexian Ornithopter
(Uk) Original Skullclamp
(Uk) Glorious Dragon-Kin
(Uk) Soul of Mirrodin
(Uk) The Forgotten Place
(Uk) Artifact Unknown Shores
(Uk) Theros Charm
(Uk) Isamaru and Yoshimaru
(Uk) Ulgrotha Charm
(Uk) Phyrexian Adapter
(Uk) Toothy and Zndrsplt
(Uk) Welcome to Mini-apolis
(Uk) Innistrad Charm
(Uk) Myojin of Night's Reach and Grim Betrayal
(Uk) Tarkir Charm
(Uk) Jeska and Kamahl
(Uk) Joven and Chandler
(Uk) Norin and Feldon
(Uk) Kamigawa Charm
(Uk) Chatterstorm and Awaken the Woods
(Uk) Riku and Riku
(Uk) Colossal Dreadmaw and Storm Crow
(Uk) Riven Turnbull and Princess Lucrezia
(Uk) Avacyn and Griselbrand
(Uk) Koma and Toski, Compleated
(Uk) Knowing // Half the Battle
(Uk) Segovian Sword
(Uk) Manakin and Millikin
(Uk) Luxior and Shadowspear
(Uk) Sword of Fire and Ice and War and Peace
(Uk) The Belligerent and Useless Island
(Uk) Mysterious Confluence
(Uk) Try-My-Deck Elemental
(Uk) White Rhystic Study
(Uk) Ensoul Ring
(Uk) Delve Too Deep
(Uk) The Dilu Horse
(Uk) Eldest Dragon Highlander
(Uk) Potatoes
(Uk) Sagrada Familiar
(Uk) Toe-Breaking Helmet
(Uk) Bram, Baguette Brawler
(Uk) Really Charming Prince
(Uk) Wrath of Oko
(Uk) Night Out in Vegas
(Uk) Believe in the Cleave
(Uk) Force of Rowan
(Uk) The Alright Henge
(Uk) Garruk's Lost Wolf // Hey, Has Anyone Seen Garruk
(Uk) HONK!
(P) (Uk) Questing Cosplayer
(Uk) Cat Oven
(Uk) Cinnamon, Seasoned Steed
(Uk) Gingerbehemoth
(Uk) Kevin, Questing Dragon
(Uk) Elemental, My Dear
(Uk) The Value Knight
(Uk) Bloodsplatter Vampire
(P) (Uk) Halving Season
(Uk) The Crafter
(Uk) The Crimson Avenger
(Uk) Ate-o'-Clock
(Uk) The Bear Force Pilot
(Uk) Primetime Suspect
(Uk) The Roaring Toeclaws
(Uk) The Spike Cactus
(Uk) The Duke of Midrange
(Uk) Deep Dish Pizza
(Uk) Karlov's Crossbow
(Uk) Simic Slaw
(Uk) The Magic Bandit
(Uk) The Juzam Master
(Uk) The Great Juggernaut
(Uk) The Massive Zacatl
(Uk) The Keeper of the Yellow Hat
(Uk) The Marvelous Scientist
(Uk) The Master of Cuisine
(Uk) Black Tulip
(Uk) Leisure Bicycle
Shichifukujin Dragon
Robot Chicken
Deb Thomas
(P) Omenpath to Naya
(P) Fetching Garden
(P) Gobland
(P) The Heron Moon
Urza's Science Fair Project
(P) Gorilla Tactics
Ersta, Friend to All
Cardboard Carapace - Counts copies in the sideboard. Not exactly as written but very little room for improvement. Adventure+Quest Inventories?
Shoe Tree - Can't use actual shoes for counters sadly.
"Ach! Hans, Run!" - Just have to name the card.
Booster Tutor - Might want to expand to letting the player choose the pack instead of a random one, for consistency with Lore Seeker.
Urza, Academy Headmaster - Just chooses a random effect from his list, no internet connection required.
B.O.B. (Bevy of Beebles) - Link between loyalty counters and beebles is implemented as a state based action and static trigger. Probably fine? May need an exception to implement Rules Lawyer.
(P) Slivdrazi Monstrosity - Granting devoid made to work by actually removing their colors.
(Uk) Phila, Unsealed - Oracle replaced with the winning team's text rather than an always-on characteristic defining ability. Probably makes more sense this way.
(Uk) Disguise Agent - Loses some of its flare when commanders are public knowledge. See "Face Down Commanders", Tier 3.
(Uk) The Keeper of Dark Pacts - Done via Intesify. Unclear if this should affect other copies of the same card.
(Uk) The Rebellious Intelligence - Random card in sideboard. May need special attention if we ever rework Wish.

Functional Variants

Sly Spy F
Garbage Elemental C
Garbage Elemental D
Everythingamajig C

Subgames

Enter the Dungeon
The Countdown is at One

Token Cards

(P) Time Sidewalk
(P) Bone Rattler
(Uk) Leech Medic

Change Commanders

(P) You're in Command
Champions of Archery // Join the Group

Contraptions

Accessories to Murder
Applied Aeronautics
Arms Depot
Auto-Key
Bee-Bee Gun
Boomflinger
Buzz Buggy
Deadly Poison Sampler
Dictation Quillograph
Dispatch Dispensary
Division Table
Dogsnail Engine
Dual Doomsuits
Duplication Device
Faerie Aerie
Genetic Recombinator
Gift Horse
Gnomeball Machine
Goblin Slingshot
Guest List
Hard Hat Area
Head Banger
Hypnotic Swirly Disc
Inflation Station
Insufferable Syphon
Jamming Device
Lackey Recycler
Mandatory Friendship Shackles
Neural Network
Oaken Power Suit
Optical Optimizer
Pet Project
Quick-Stick Lick Trick
Rapid Prototyper
Record Store
Refibrillator
Sundering Fork
Targeting Rocket
Thud-for-Duds
Top-Secret Tunnel
Tread Mill
Turbo-Thwacking Auto-Hammer
Twiddlestick Charger
Widget Contraption
Sap Sucker

Contraption Support

Jackknight
Aerial Toastmaster
Midlife Upgrade
Riveting Rigger
Chipper Chopper
Incite Insight
Spell Suck
Suspicious Nanny
Finders, Keepers
Overt Operative
Steady-Handed Mook
Garbage Elemental B
Steamflogger of the Month
Steamflogger Temp
Steamfloggery
Work a Double
Wrench-Rigger
First Pick
Joyride Rigger
Steamflogger Service Rep
Clock of DOOOOOOOOOOOOM!
Cogmentor
Contraption Cannon
Steamflogger Boss - (Not an Un-card)

Tier 0.5: Done*

Blacker Lotus - Only removes from match. Should delete from deck and/or collection in limited and adventure-like modes.
Ass Whuppin - Implemented as "Destroy target silver bordered permanent," leaving off the Acorn errata and the ability to target other games.
Spatula of the Ages - Implemented to look for silver border, but has since been errata'd to include acorn cards. (See also: "Un-Cards", Tier 2.)
Border Guardian - Borders are only tracked on an edition level. Silver-bordered SLD cards and borderless prints won't behave correctly. (See also: "Border Color Matters", Tier 3)
(P) Planequake - "Uncovered Cavern" plot booster still doesn't exist.
Sword of Dungeons & Dragons - Dragon token is colorless, not gold. See "NonWUBRG Colors" in Tier 5.
Mountain Mover - Cards stored "Underneath" Mountain Mover are put into exile instead.
(P) (Uk) Anax and Cymede & Kynaios and Tiro - Was renamed from "and" to "&" for its MB2 reprint. Current implementation uses "and". Scryfall uses "&" for both now.
1996 World Champion - Activated ability in library is implemented as an emblem created at the start of the game.
War of the Spark - "from War of the Spark" is currently implemented with City in a Bottle logic, which reportedly could use some revision. Unclear if card is meant to look at exact printing or original printing. (See also: "Set Matters", Tier 2)
(Uk) The Battle of Dragon Brothers // Fate Reforged - Notes choices by card name similar to a draft choice.

Banned and Restricted as an effect

(These cards "ban" themselves or other cards via their text, but won't register alongside format bans. Can matter for wish effects.)

Once More With Feeling
Look at Me, I'm the DCI
Gleemox

Host Cards

(These work fine on their own, but can't reach their full potential without the Augment cards)

Adorable Kitten
Shaggy Camel
Mer Man
Numbing Jellyfish
Big Boa Constrictor
Dirty Rat
Stinging Scorpion
Bumbling Pangolin
Feisty Stegosaurus
Eager Beaver
Mother Kangaroo
Wild Crocodile
Angelic Rocket
Gnome-Made Engine
Labro Bot
Voracious Vacuum

Keyword or Mechanic Recreated via Card Script

(These cards have unique un-keywords or mechanics which haven't been implemented within the engine, but have been scripted such that they should work the same way for the most part. Edge case interactions may exist however, and a "keyword-matters" un-effect wouldn't be able to include them.)

Earl of Squirrel - Squirrellink; Uses a static trigger instead.
Nearby Planet - Rangeling; Uses a continuous "is all basic land types and all non-basic land types" ability.
Rainbow Dash - Player Coolness; Creates "Coolness Badge" effects to represent every 20% of coolness.
(Uk) Phyrexian Esthetician - Oil Scavenge
(Uk) Hound of Urabrask - "Oildying" (Undying but oil counters.)
(Uk) Incubob - "Incubate Dark Confidant 1"

Tier 1

Either works within the rules, or could be scripted without engine changes.

Burning Cinder Fury of Crimson Chaos Fire
Ricochet
Free-Range Chicken
Gerrymandering
Team Spirit
GO TO JAIL
The Big Idea
Krark's Other Thumb
Fluros of Myra's Marvels
(P) Baneslayer Aspirant
(P) Priority Avenger
(P) Innocuous Insect
(P) Truth or Dare
(P) Buried Ogre
(P) A Good Thing
(P) Barry's Land
Gifts Given
Svega, the Unconventional
(P) Common Black Removal
(P) Call from the Grave
(P) Chatzuk, Mighty Guitarist
(P) Dwarven Confluncer
(P) Fludge, Gunk Guardian
(P) Flanking Licid
(P) Hish of the Snake Cult
(P) Indicate
(P) Jeskai Baller
(P) Jund 'Em Out
(P) Lazotep Archway
(P) Microscope
(P) Magus of the Chains
(P) Meandered Towershell
(P) Noble Ox
(P) Pinchy McStingbutt
(P) Processing Plant
(P) Penumbra Umbra
(P) Rin and Seri, Inseparabler
(P) Rule with an Even Hand
(P) Stone Drake
(P) Search Elemental
(P) Wrath of Leknif
(P) Wowzer, the Aspirational
(Uk) Echoing Echo
(Uk) Old Way Phyrexian
(Uk) Hidetsugu's Poison Rite
(Uk) Pulse of the Hunter Maze
(Uk) Goblin Savant
(Uk) Platinum Persecutor
(Uk) Mindslaver Toolkit
(Uk) Call Up Emrakul to Help
(Uk) Kylem All-Star
(Uk) Gerrard and Hanna
(Uk) Invasion Specialist
(Uk) Nevermind
(Uk) Phyrexian Cytoshaper
(Uk) Emrakul and Chatterfang
(Uk) Halana and Alena and Gisa and Geralf
(Uk) Autumn Willow and Baron Sengir
(Uk) Jitte and Divining Top
(Uk) Bob the Claymore
(Uk) Battle Myrsphere
(Uk) One Does Not
(Uk) Math is for Blockers
(Uk) My Deck is About a Seven
(Uk) Maitre Tree
(Uk) Ano'thr, Equipment Commander
(Uk) Rankle, Master of Pranksters
(Uk) Princess Snowfall
(Uk) Identify the Culprit
(Uk) The Knight of Weeks
(Uk) Impressive Rat
(Uk) The Dogronmaster
(Uk) Windmill Slam
(Uk) The Joiner of Cats
(Uk) Bag of Stroopwafels
(Uk) Famous Museum
(Uk) Seer of the Bright Side
(Uk) The Wiley Speedster
(Uk) The Sixth Seraph
(Uk) The Powerful Dragon
(Uk) The Cobra King
(Uk) Another Night in Vegas
(Uk) First Stage of Magic Design
Jester's Sombrero - May be able to do this with RemoveFromMatch?
Gallery of Legends - (Attraction) Similar to Killer Cosplay?
(P) Gunk Slug - Similar to Time Sidewalk and Bone Rattler?
(P) Problematic Volcano - Similar to Raging River?
(P) Patient Turtle - Player went first this game. Seen with Forsaken Crossroad.
(P) Alberix, the Trade Planet - Resources seem mostly equivalent to "card exiled by CARDNAME", barring linked ability issues.
(P) Bolshack Dragon - Dunno if strikethrough in oracle text would be formatted, but is functionally all possible.
(P) Lich's Duel Mastery - Like Alberix, Shields seem like another "card exiled by CARDNAME".
(P) Luxior, Ignited - Nothing in the rules says a Planeswalker can't be attached to a creature...
(Uk) Untap, Upkeep, Draw - Similar to Obeka, Splitter of Seconds.
(Uk) Compleated Clone Shell - Think there should be some way to look at 4 random cards in the sideboard?
(Uk) Azorius Traffic Enforcement - DisableTriggersEffect looks like it could focus on Backup abilities? Detain as a keyword action probably doesn't need special treatment.
(Uk) That's No Moonmist - Can use the existing "FrontFace" property.
(Uk) Praetorhoof Behemoth - Adds number of revealed cards to number of matching cards in zones. Should be doable.
(Uk) Unknown Event Shores - Complicated, but the same support is needed for Cryptic Spires.
(Uk) Syr Konrad's Squire - Would probably work fine as separate abilities.
(Uk) Life at Stake - Similar to Wheel of Misfortune
(Uk) Investi-Gate - Just choose and create two of the ten guildgates?
(Uk) The Inspector Inspector - Should be possible with ETBReplacements...
(Uk) The Zassacre Zirl - Removing a card's commander status is now totally do-able; (See "You're In Command", Tier 0)
(Uk) The Keeper of Kaldra - Companion effect can be written out manually, should work fine.
(Uk) The Keeper of Four Scythes - Scythe tokens not defined in rules, but could just be scripted normally.
(Uk) Hosting Season - Can ignore the date conditions since they'll never apply again.
(Uk) The Bean - (Plane)
(Uk) Black Lotus Lounge - (Plane)
(Uk) City Hall - (Plane)
(Uk) Shy Town - (Plane)
(Uk) Sky Deck - (Plane)
(Uk) The Windy City - (Plane)
(Uk) Bicycle Rack - (Plane)
(Uk) Event Horizon - (Plane)
(Uk) The Food Court - (Plane)
(Uk) Oteclán - (Plane)
(Uk) Probability Flux - (Plane)
(Uk) Tarnation - (Plane)

Rerolling Dice (statically)

(Difficult, but feature is needed for some legal UNF like Monitor Monitor and Xenosquirrels)

Clam-I-Am - Option to reroll threes.
Wall of Fortune
Snickering Squirrel
(See also: Socketed Sprocketer, Tier 2)
(See also: "Rerolling Dice (using the stack)", Tier 4.)

Card Packs

(We have Booster Tutor. MakeCard can probably support these?)

Summon the Pack
Opening Ceremony
(Uk) Unknown Event - (Phenomenon)

Doesn't Actually Do Anything

(P) Abbot of the Sacred Meeple
(P) Spuzzem Strategist - Unless R&D's Secret Lair is implemented and they're playing Floral Spuzzem...

City in a Bottle Effect

(i.e. cares about cards that were printed in one or more specific expansions)

(Uk) Crux of Mirrodin
(Uk) Sheoldred's Terror - May change if Argentum is revisited
(Uk) Delphia, Undecided
(See also: "Set Matters", Tier 2)

Commander-tron Lands

(Urzatron lands have special support, but could probably be scripted without it.)

(Uk) Command Mine
(Uk) Command Power Plant

Choose and create random card from a list

(ChooseCardNameEffect should be able to do this, and CopyPermanent with "DefinedName$ NamedCard" looks like it will work.)

(P) (Uk) Who's That Praetor?
(Uk) Form of the Stax Player
(Uk) The Crab Queen
(Uk) The Disciple of Vess
(Uk) The Scholar of Seas
(Uk) The Disciple of Nissa
(Uk) The Ash Lizard
(Uk) The Wise Sable

Tier 2

Spiritually works within rules, new variations on existing features, and/or minor engine changes needed.

Psychic Network - Top cards of decks visible to all opponents. Maybe not by holding it against the player's head but revealing it would work fine.
Get a Life - Exchange life with teammates. Unclear how this exchange works with more than 2 players on a team, but could probably dig that info up somewhere.
Curse of the Fire Penguin - Enchantment that replaces typeline, stats, and textbox. Unsure if this is a different layer than normal.
Six-y Beast - May need its own AI flag. It would want to favor higher numbers both when placing counters and guessing them. Also needs to account for counter-doublers in play.
By Gnome Means - "Choose any kind of counter a printed card refers to"
Rules Lawyer - Think there are a few complications to just skipping over SBA's, but seemed doable.
Kindly Cognician - Text matters, but only the Oracle text, not the printed text like most Un-cards.
Socketed Sprocketer - Already have diceroll storage from Centaur of Attention, just need uninstall as a cost and the diceroll changes for Monitor Monitor
Spike, Tournament Grinder - Wishes for banned cards.
Squirrel-Powered Scheme - +2 to all dice rolls. Might be possible with current replacement effects?
Standard Procedure - "currently legal in Standard"
Far Out - Makes Modal Choices into "Choose one or more". Maybe just a replacement effect on Charm?
Animate Object - Effect doesn't really care what the object is. Could just be a token. Might be fun to have a selection of images of random household items to represent the token. (But also Stickers)
Pie-Eating Contest - Can't physically eat food to pay the X cost, but can still sacrifice food tokens.
Tug of War - Start subgame with 3 chosen cards in battlefield.
(P) Ral's Vanguard - Vanguard with "Requirement"
(P) Enroll in the Coalition - Player is a Flagbearer.
(P) Learned Learner - Maximum hand size other than 7. Does this include "no maximum hand size"?
(P) Blood Poet - Spark abilities.
(P) Everlasting Lich - "Can't die."
(P) Swarm of Locus - Creature with Land Type
(P) Witty Demon - Starting deck size compared to minimum, similar to Yorion.
(P) Lazier Goblin - Motivate keyword. Can't attack or block until one-time cost is paid.
(P) Red Herring - Swaps itself from the hand with a permanent in play, swapping targets on the original to itself. Also name collision.
(P) Trial and Error - Triggers when countered or fizzled. Elemental Card Type.
(P) Geometric Weird - "Greatest number of spells and abilities from different sources that were on the stack simultaneously this turn"
(P) Kaya, Ghost Haunter - Haunt target creature, target haunted creature.
(P) Pick Your Poison - Nearly identical to point value modal choices seen in Bloomburrow, but no icon and points must add up to exact value. Also name collision.
(P) Seek Bolas's Counsel - Planeswalk in a non-planechase game.
(P) Rift - Can start in your opening hand.
Snow Mercy - Cost of Tap, Untap, Tap, Untap, Tap.
Princess Twilight Sparkle - Unclear if everybody winning is the same as a draw, but otherwise works fine within the rules. Shame the cards it depends on don't.
(P) Creepy Crawler - "Afraid" status. Needs to know about applicable cards even if they left play already.
(P) Catch of the Day - Multiple chosen modes to specify abilities and stats as it enters. May work as is?
(P) Don't Worry About It - Animate dead works. Dunno if a hidden zone does, though.
(P) Essence of Ajani - Emblem spell.
(P) Knight of Lost Causes - "Way behind" state.
(P) Lifening Elemental - Creature that splices onto spell. Might work as-is?
(P) Liliana's Other Contract // Liliana's Undead Minion - Think it works in the rules, but may need some hack to display it face up when it transforms.
(P) Night of the Flying Merfolk - Bedtime Story, puts lore counters on only at end step.
(P) No-Regrets Egret - Serum Powder exists, but its implementation is hard-coded.
(P) Narod, the Beige Flower - Assign damage equal to mana value rather than power.
(P) Orb of Origin - Brings back Mono and Continuous artifact types and their functions.
(P) Pokey, the Scallywagg - Replace coin flipping with dice rolling and vice versa. May be possible already?
(P) Subgoyf - Number of different non-creature subtypes in graveyards.
(P) TL;DR - Check if card has non-keyword abilities.
(P) The Many Deeds of Belzenlok - Copy specific numbered chapter ability from a Saga.
(P) Toddler's Rage - Tantrum, like trample but for blocking.
(P) Wormhole Warp - Reveal cards from sideboard at random until...
(P) Your Wish is My Command - Choose an extra mode for a spell cast this way.
(Uk) Agoraphobic Phyrexian - Could reasonably be adapted to affect the Planechase plane instead of the Unknown Event plane. Should be possible to RemoveAllAbilities from a Plane?
(Uk) Xerex Squire - Square root, or maybe just add hypotenuse support to X-math.
(Uk) Occupation of Llanowar - Control Point battle type.
(Uk) Phyrexian Incubator - Properties of back face of card in library.
(Uk) Fioran Reformist - Remove the Monarch. Democracy can just be implemented in the card script.
(Uk) Dockbreacher - Number of treasures created this turn.
(Uk) Ring Out - Unsure if TriggerZones supports Library.
(Uk) Soul Drainer - Resets commander damage
(Uk) Triple Threat - Triples commander damage
(Uk) Kallist Rhoka - Becomes a copy of another card while on the stack, other card becomes copy of it. May be possible now?
(Uk) Simic, Value Engine - Count opponent's lands played and cards drawn last turn.
(Uk) Power Level Analyzer - Difference between two players' chosen numbers. Could probably modify logic from The Toymaker's Trap.
(Uk) Mana Conference - Doesn't look like ChooseTypeEffect yet supports multiple players choosing.
(Uk) Adventurer Beguiler - Recognizes "on an adventure", distinct from other may-play effects.
(Uk) Grek the Ogre - Filter list of choices based on creatures you control.
(Uk) Maeve, Wearer of Many Hats - "Any number of Role enchantments may be attached to CARDNAME"
(Uk) Guild Pact - Pay mana of chosen colors
(Uk) The Curve Keeper - Longest consecutive mana curve.
(Uk) The Fish Brewer - Panharmonicon, but tap fish to increase number of triggers.
(Uk) Irrefutable Evidence - Triggers when chosen for Collect Evidence
(Uk) The Sprinkler of Stardust - There's probably some reason Magar couldn't be written this way...
(Uk) The Pleasant Taxer - Taxes searching a library.
(Uk) The Karst, Enchanted - Different toughness and different card types while searching.
(Uk) Genevieve, Conniving Dragon - Party die. X-Math for number of sides on a regular die roll?
(Uk) That Which Was Compleated - Gaining poison counters as a cost.
(Uk) Artist Alley - (Plane) Choose card with favorite art. Would have to work on the honor system. AI can pick randomly.
(Uk) Quest Compleated Beast - Fear of Sleep Paralysis brought some "can't remove counters" support, but doesn't yet include players.
(Uk) The Tokenator - Token's power and toughness is any combination that totals a certain value.
(Uk) The Weekly Princess - "Stops being day or night" - shouldn't be tough but needs a couple tweaks to work.
(Uk) Zimone's Homework - Similar to prime matters, but Fibonacci, lazy caterer's sequence, and square numbers matter instead.
(Uk) The Archenemy's Charm - Set scheme in motion in non-archenemy game.
(P) Second City - "Spend this mana only to cast your second spell in a turn."

Unique but Simple Keywords

(These have custom keywords or named mechanics that could probably be reproduced within a card script. See "Keyword or Mechanic Recreated via Card Script", Tier 0.5)

(P) Squidnapper - Ransom keyword ability, a cost an opponent may pay statically to nullify an ongoing effect.
(P) Spellmorph Raise Dead - Basically morph for instants and sorceries.
(P) Bear with Set's Mechanic - Aggressive keyword. Similar to Last Night Together? Could possibly do it through a unique effect like Gollum, Obsessed Stalker.
(P) Avacyn's Collar, the Symbol of Her Church - Shackle keyword is just Equip for enemy creatures.
(P) Arcanum Things - Equipment swap keyword.
(P) Boltfire - Flashforward, flashback but card goes to bottom of library.
(P) Forbidden - Limit to 0 copies per deck. See current implementation of Gleemox, Tier 0.5.
(P) Dairy Cow - Grazing type is just an enters with counters RE.
(P) Flavor Disaster - Negamorph is megamorph with -1/-1 instead of +1/+1
(P) Immersturm Battlefield - Hosting creatures, should work via imprint.
(P) Kozilek, Compleated - Annihinfect: Annihilator equal to defending player's poison counters.
(P) Marchesa's Surprise Party - "Conspiracy - Secret Mission."
(P) Maestros' Totally Safe Hideout - Land casualty
(P) Pyromancy 101 - Teach
(P) Phyrexian Seedling - Proliferatelink, might work fine as a static ability?
(P) Plain Walker - Planeswalkerwalk
(P) Sliver of Hope - Hope, prevent damage to it while attacking.
(P) Vuzzle Spaceship - Spaceship and spaceship abilities.
(P) You Compleat Me - Maximum life total becomes 10 for the rest of the game. Emblem with activated ability?
(Uk) Sawtooth Avenger - Megasunburst
(Uk) Oilskelion - Oil Sunburst
(Uk) Rattatwotwo - Chef Role
(Uk) Wistful Puppeteer - Animated Role
(Uk) The Miniaturizer - "Soospect", granting First Strike and can't block. Designation never checked.
(Uk) Urza's Hot Dog Stand - Food Crew
(Uk) The Judge of Height - "Height", which is toughness plus mana value.

Mono-Eminence Cycle

(Can probably be tested for with existing tools.)

(Uk) Theopholos, Order Acolyte
(Uk) Lorthos, Tentacled Terror - (Also starting hand size.)
(Uk) Auntie Flint
(Uk) Mzed, Mercenary Leader
(Uk) Mr. Wiggles, Helpful Butterfly - (Also tutor to battlefield before game starts?)

Variations on Existing Keywords

(More complex than above; need engine changes rather than just scripting them. Nothing unprecedented though.)

(P) Friarball - Coststorm keyword, count different mana values among spells and lands this turn.
(Uk) Arcbound Mamba - Poison Modular, +1/+1 counters placed on players by it become poison counters.
(Uk) Memnarchitect - Affinity for artifact creatures that weren't originally artifact creatures. Check changed types?
(Uk) Sojourner's Enforcermite - Affinity for Affinity. Also Affinitycycling.
(Uk) Shadowmoor Draw Spell - Untap Convoke.
(Uk) Farseeing Flockmate - Flying backup, variant of backup that gives flying counters.
(Uk) Azra Matchthrower - Battlebond, soulbond except it pairs with Battles.
(Uk) Merfolk Surveyor - Explore-clash, clash but also effects of explore using revealed cards.
(Uk) Groaaaaag, Hungry Monster - Commander Suspend, Suspend from command zone with commander tax applied
(Uk) The Companion of the Wilds - Old Companion (Also Set Matters and Playtest Cards matter, Tier 2).

Commander Enchantment

(Enchant commander, but remains attached in all face up zones. Animate Dead seems like precedent.)

(Uk) Taught by Serra
(Uk) Taught by Narset
(Uk) Taught by Vito
(Uk) Taught by Bruce Tarl
(Uk) Taught by Surrak

Flip Self

(Doesn't care about where it lands, only whether it's face up or down. Essentially a coin flip.)

Orcish Paratroopers
Trapeze Artist

Specific Action or Dialog as payment

(Could implement these as zero costs. Would be more fun to declare actions with popups or chat messages though.)

Knight of the Hokey Pokey
Mesa Chicken
Infernal Spawn of Evil
Urza's Contact Lenses
Emcee
Rod of Spanking
Impounding Lot-Bot
The Majestic Duo
(See also: Magic Word, Tier 3)

Compliments, Insults, Apologies

(Similar to above, but less specific wording. Could be done in spirit by keeping pre-defined list of phrases and let the player choose one.)

Miss Demeanor - Possibly an activated ability.
Mother of Goons
Chivalrous Chevalier
An Incident Has Occurred

Trackers, Markers, and Unique Designations

The Fallen Apart - Arms and Legs
B-I-N-G-O - Chips on bingo board in art
Togglodyte - ON/OFF
Baron Von Count - Doom Counter
(P) Loopy Lobster - Stages
(P) Bucket List - Check off card types
(P) Duelists' Convocation International - Check off digits of random 10-digit number.
(P) Map to Lorthos's Temple - Checklist of objectives

Maintaining lists

(Similar to noting things, but not just card IDs)

(P) Champion of the Hareish - "Buddy List", noting creature types.
(Uk) The Keeper of Favorite Cards - "Favorites List", noting card names.

Panglacial Worm-likes

Infernal Spawn of Infernal Spawn of Evil - (Also dialog as payment)
(P) Biting Remark - Cast while scrying.
(P) Sunimret - Cast from bottom of library.

Split Card made from Two Existing Cards

(Might work fine as-is?)

(P) Bind // Liberate
(P) Start // Fire - From two halves from other split cards

Cards in Non-owner's Hidden Zones

Five-Finger Discount
Spy Eye
Very Cryptic Command C
Sly Spy E
X
Centrifuge - (Attraction)
Naughty // Nice
Last-Minute Chopping
(P) All-Star Kicker - Via "Pass the Ball". Also Assist Kicker.
(Uk) Trash Panda - Also "Opponent dredge".

Other Un-Games

(It would be fun to include concurrent games running in other tabs. Aside from that, seeing only the current game misses the spirit of the card but technically works fine, and these would otherwise be in Tier 6 or 7.)

Side Quest
Exit Through the Grift Shop
(See also: "Ass Whuppin", Tier 0.5)

Turn Over Card

(Transform if it's a DFC, becomes a 2/2 if it's a normal card, splits up melded cards...)

Very Cryptic Command D - Also put card in controller's hand
Optimus Prime, Inspiring Leader

Un-Cards

(Looks for Silver Bordered or Acorn cards, but not playtest or Heroes cards. This category probably needs to be defined anyway.)

Everythingamajig B
Underdome
(See also: Spatula of the Ages, Tier 0.5)

Playtest Matters

(Looks for playtest cards. Similar to the above, this should probably be a defined category anyway.)

(Uk) Magic Designer
(Uk) Playtest Wish
(Uk) Stika, Playtestress
(Uk) The Unknown Wizard
(Uk) Fear of the Unknown
(See Also: The Companion of the Wilds, Tier 3)

Set Matters

(The wording of these often varies and it's sometimes unclear how reprints should be treated. Tempted to throw them all in tier 4.)

Heroes of Kamigawa - "Name printed in a Kamigawa expansion". Maybe a variation on Apocalypse Chime's set filter, to include reprints? Also booster pack, but of a specific type. May also need future-proofing against new Kamigawa sets.
Keeper of the Secret Lair - Another set filter like above, but matching the set of the current print.
(Uk) Across the Multiverse - Only includes the main set, no bonus sheets.
(Uk) Must Be Knights - Specifically printings from Enchanting Tales (WOT).
(See also: War of the Spark, Tier 0)
(See also: "Apocalypse Chime" and "City in a Bottle", Black Border)
(See also: "City in a Bottle Effect", Tier 1)

Extra Zones

(P) Whammy Burn - Whammy deck.
Myntasha, Honored One - Booster pile, Booster cascade, Open a Booster as a cost.
(Uk) Royal Booster - (Phenomenon) Booster deck. Like booster pile but shared?

Partner Variant

(Needs some fleshing out of the Partner conformity checks and deckbuilder logic)

Sol, Advocate Eternal - Partners with any creature.
Wizard from Beyond - Background that partners with any nonlegendary creature.
(Uk) Barce, Friend Finder - Partner with any legendary creature with 0-1 colors in color identity.
(Uk) The Knight of Land Drops - Partner with any legendary knight.
(P) Mothers Yamazaki - Might mostly work if just written as "Partners with Mothers Yamazaki", though will need a rule bend to allow 2 copies in singleton formats.

Spell Commander

(From the Unknown Event in Barcelona, 2023. These are meant to use the ruling that mono-color legendaries all have Partner in Limited Commander events, which isn't currently implemented. Also they all have normalized name collisions.)

(Uk) Gather, the Townsfolk
(Uk) Clear, the Mind
(Uk) Ransack, the Lab
(Uk) Lava, Axe
(Uk) Rampant, Growth

Ready to Run

(Normal partner variant)

(Uk) The Caffeinated Runner
(Uk) The Milling Runner
(Uk) The Bus Runner
(Uk) The Gunky Runner - Also beginning of first upkeep trigger. (See also: "Fludge, Gunk Guardian", tier 1)
(Uk) The Wheeling Runner - Also a Vintage-legal filter on random card creation.
(Uk) The Highland Runner - Also beginning of first upkeep trigger.
(Uk) The Bear Force Pilot Runner - Apparently this is an errata on an existing Unknown Event card?

Mana from Particular Source

(Similar to snow costs)

(P) Experiment Five - Mana from a source that could produce two or more colors of mana. Use some production awareness like Exotic Orchard?
(P) Keeper of the Crown // Coronation of the Wilds - {L}, one mana from a legendary source.
(P) Yawgmoth's Day Planner - Mana produced by abilities that caused you to lose life.

Unknown Event Team

(During the Philadelphia 2023 Unknown Event, players were split into two teams. These cards changed behavior based on which team you were on. Could be imitated by having the player pick a team once then retain that for all cards.)

(Uk) Unclaimed Cat
(Uk) Unclaimed Bird
(Uk) Unclaimed Blessing
(Uk) Tricky Mage
(Uk) Unclaimed Battle Axe
(Uk) Furnace Oriflamme
(Uk) Unclaimed Tanadon

Pledge Mechanic

(Uk) Guildmark
(Uk) Guilded Lotus

Poison Tolerance

(Uk) Rosewater's Nemesis
(Uk) Drake with Set's Mechanic
(Uk) Long Term Phyresis Study
(Uk) Burn the Phyresis
(Uk) Naturalize the Phyresis
(Uk) Melira's Snacks

Unknown Event Planes

(During the Minneapolis 2023 Unknown Event, Planechase-like planes were in effect for all games across the event. These ones could be implemented as normal Planechase cards.) (These currently aren't on Scryfall)

(Uk) Ondu - Alternate land drop
(Uk) Mana Flood Ridge
(Uk) Sagu
(Uk) Shard Boundaries
(Uk) The Inversion Zone
(Uk) The Moon
(Uk) Istfell

Command Tax Matters

(Uk) Tax Hounds
(Uk) Tax Draw
(Uk) Tax Sweeper
(Uk) Tax Bolt
(Uk) Tax Keeper

Match Score matters

(P) Ruff, Underdog Champ
(Uk) Fear of Going 0-2 Drop

Enters with Booster

These both enter with a sealed booster "under" them, and open it upon dealing combat damage. Could do something like Mountain Mover - get a booster's cards, put all the cards from it face down in exile, then reveal them later.

Stocking Tiger
(Uk) The Chaos Keeper

Tier 3

Possible to implement, but needs whole new features and/or substantial engine changes.

The Ultimate Nightmare of Wizards of the Coast® Customer Service - Y and Z costs. Comet Storm is functionally the same 99% of the time, but why implement this at all if you're not accounting for the other 1%?
Collector Protector - Giving away a card. Could work similar to Ante. Only really meaningful in limited and adventure-like formats.
Rocket-Powered Turbo Slug - Essentially a Pact, but as a keyword and the cost can be paid any time on the next turn. Unclear how this interacts with cost adjustments. FAQ also adamant that Super haste is not a form of Haste.
Gleemax - Control all targets.
Magic Word - Choose arbitrary word, whisper it as cost. Could make it another zero cost but loses spirit of card.
The Grand Calcutron - Hands are all public, ordered, have to be played in order, and cards added to hand are put at a position chosen by the player.
Infernius Spawnington III, Esq. - Number of cards "revealed" this turn.
Goblin Blastronauts - "Copy the spell, ability, or Attraction visit that caused you to roll that die." Might be possible to get this in RollDiceEffect and pass it on?
Sole Performer - Taps for {T}{T}, a resource used to pay {T} costs.
(P) Metagamer - Could just hard-code the list since the errata promised in the rulings is still forthcoming. If/when it does happen though, would need to be maintained, or a solution for auto-updating it would need to be implemented.
(P) Do-Over - Restart the turn. Possible with Undo Restore logic?
(P) Memory Bank - Affects future game in match. See also, "Between Games" in Tier 4.
(P) High Troller - All targets chosen randomly. (Number of targets still chosen by player)
(P) Mana Abundance - ReplaceMana, except it changes who gets it.
(P) Siege Elemental - Untapped creatures can't block, tapped creatures can.
(P) Maro's Gone Nuts - "Double any effect that doubles." No catch-all way to detect this but there aren't that many effects that this applies to...
(P) Zymm, Mesemeric Lord - Opponent orders their hand, reveals it one by one until you stop them.
(P) Weaponized Scrap - Upgrade. Similar to mutate for artifacts? Somewhat different merge rules though.
Decorated Knight // Present Arms - Swap deck with one outside the game, while still being able to draw from it. Could possibly use the extra zones used by Backup Plan?
(P) Boulder Jockey - {D}, a cost that when paid, reduces your potential land drops for the turn.
(P) Cleaver Blow - Multicleave.
(P) Defender of the Queue - Positioning keyword, orders battlefield from left to right and affects "adjacent" creatures.
(P) Heart of a Duelist - Could show the library zone face down and let player pick the card to be drawn?
(P) Plant a Sapling // Fully-Grown Treefolk - Transform while in library.
(P) Snap Judgment - Winning the game wins the match.
(P) Tax Taker - Whenever an opponent pays a cost imposed or increased by one of your cards.
(P) Two by Four - "Base power 4 counter" and "Base toughness 4 counter".
(P) Zone of Flame - Enchant any zone, shared or individual.
(Uk) Sort of ____ and ____ - Assemble a combat trigger from two chosen modes.
(Uk) Incubation Triformer - Transform a transformed phyrexian token to a "third side" which is a 3/3.
(Uk) Polis the Planeshifter - Copies abilities from a random planechase plane, activates corresponding chaos effects and changes planes via activated ability.
(Uk) Shahrazad and Sindbad - "If there haven't been any subgames this match"
(Uk) Unicycling Atomaton - Hand Backup, gives abilities to card in hand until end of turn, and its +1/+1 counter when it "eventually" comes into play.
(Uk) Huge Truck - Permanently gains abilities shared by a backup ability. Includes backup variants too.
(Uk) Shedding Snake - Resets command tax. Probably shouldn't affect "times cast from the command zone this game", though.
(Uk) Lona, Tracker of the Known - Number of english sets a card has been printed in. Bit messy but possibly do-able.
(Uk) Margle, Cousin of Yargle - "Can't gain abilities"
(Uk) Spice Rack - Maximum Commander size. Sounds like an SBA; Could maybe simulate but would want to suppress commander replacement effect.
(Uk) Banned Eldraine Card - Choose an additional cost that determines which card it becomes (perpetually).
(Uk) Takesies // Backsies - "Treat all counters as -1/-1 counters".
(Uk) Trampled Lotus - Activate up to three mana abilities of opponents' lands. "Splitter Second" effectively makes this a mana ability.
(Uk) The Asker of More Mana - RaiseCost can cover spells and abilities, but not resolution stuff like UnlessCosts.
(Uk) Interrogation Robot - Trivial, but partly dependent on card in this tier. (See "Who // What // When // Where // Why")
(Uk) The Horizon Seeker - Count unique keywords and ability words.
(Uk) The Convincing General - Make two creature types interchangeable.
(Uk) The Magical City, New - Land as commander.
(Uk) Mad Labs - (Phenomenon) Choose a keyword counter.
(P) Glimpse, the Unthinkable - "Can't be chosen" and name can't be chosen while in play. Also normalized name collision.
(P) Muraganda Eldrazi - "Counts as having no abilities.", but still has them. Also Primeval Counter.
(P) Omnipresent Impostor - Can be found when searching library regardless of criteria. Has all names. Basic supertype.
(P) Oddric, Lunar Marquis - Eater-of-Virtue-ing a specific triggered ability by text. Granting Devoid and Changeling will need special handling since that normally doesn't work due to layers. (See "Slivdrazi Monstrosity", Tier 0)
(P) Panglacial Shinobi - "Library ninjutsu" - have to swap it with an attacking creature. Also Panglacial Worm-likes, Tier 2.
(P) Toofer, Keeper of the Full Grip - "Card Advantage", the net change in relative hand size between you and all opponents when a spell resolves.
(Uk) Second Stage of Magic Design - Looks for unique Keywords and Ability words.
(Uk) Fear of Unsleeved Decks - Could look at the player's card back choice and see if it's the default?
(Uk) The Fearsome Flock - Split second on the level up ability. Lets you activate abilities of opponents' cards.
(Uk) Oozeavite - Keyword counters that also grant +1/+1
(Uk) The Cosplayzer - Changes first letter of name (or adds letter onto beginning of name?). Also, "The first time each turn an ability of this creature is activated or triggered"
(Uk) Seventh Stage of Magic Design - Can get most of the way there with existing spell, ability, and mana doublers, but mana abilities with side effects like Chromatic Sphere might be a leap.

Cast Cards as Other Cards

(Form of the Mulldrifter rules that the Evoke cost may be paid. Others do not rule Alternative Costs either way.)

Richard Garfield, Ph.D. - Any card with same mana cost. Also cast cards cannot be reused; it's been ruled that this persists even if it leaves and reenters.
(P) Form of the Mulldrifter - Specifically as Mulldrifter.
(P) Starting Town NPC - Adds Adventure onto card.
(P) (Uk) The Colossal Dreadmaw - Specifically as Colossal Dreadmaw.
(Uk) Elonc, Perfect Clone - As a copy of your commander.
(Uk) Fourth Stage of Magic Design - Same as Richard Garfield but only once per turn. Unclear if they share a list of chosen cards.

Text Boxes

(Usually just refers to all the abilities and keywords, and Exchange of Words does this in black border. But it has different rulings in Un-Games, where flavor text and watermarks also matter.)

Do-It-Yourself Seraph
Pheobe, Head of S.N.E.A.K. - (Also Flavor Text Matters)
Grusilda, Monster Masher - Merges two dead creatures into one living one.
It Came from Planet Glurg - Becomes a copy of X different creatures.

Multi-Split Cards

(Most split card logic currently assumes only two parts)

Who // What // When // Where // Why
(P) Smelt // Herd // Saw
(P) There // They're // Their

Phases out of Turn

Clocknapper - Steal phase from opponent
(P) Throat Wolf - Create its own combat phase during opponent's turn (Also Firstest Strike)
(P) Chronobot - Switch upkeep steps with an opponent
(P) Runed Terror - "Players take their phases sequentially"

Last or Triple Strike

(Might not be that difficult, but would want it to only show up in the phase UI when relevant)

Extremely Slow Zombie
Garbage Elemental F
Three-Headed Goblin
(See also: Throat Wolf)

Activate in Any Zone

(Including while it's in your library and you're about to search for a card with certain characteristics...)

_____ - (Also flavor text matters. Also having no name by default.)
Shellephant

People Outside the Game Joining the Game

(Could be done by introducing an AI.)

Better Than One - (Needs two-headed giant rules support.)
Kindslaver
(Uk) The Egotistical Velociraptor

Extend Duration of Effects

(Particularly "until end of turn" or "this turn" effects)

Staying Power
Grand Marshal Macie - Choose an ongoing effect, it lasts as long as this remains tapped.

Legacy

(Effects that call for the player to make a choice before the game, which is stored with the card and affects its text or characteristics. This often involves marking the physical card. Once in-game, these choices or markings are copyable attributes.)

(P) Inspirational Antelope - Also keyword or ability word matters.
(P) Gold Mine - Mark nodes during the game, they stay marked in future games.
(P) Built Bear - Spree-like effect where you mark abilities and characteristics with point values. Total points marked determines mana cost.
(Uk) Common Curve Filler - Choose and write a number; chosen number sets power, toughness, and cost.
(Uk) Awoken Nephilim - Choose a Nephilim, acts as a legendary copy of it.
(Uk) Your Mana Rock - Cryptic Spires but an Artifact.
(P) Convention Maro - Choose a trigger requirement and an X-math function. Also watermark matters, landscape matters, and artist matters.
(Uk) The Fifth Alias - List of five other cards in your deck. Unclear what to do if you have multiple copies.
(See Also: "Cryptic Spires", Black Border)
(See Also: "The Prismatic Piper", "Faceless One", and "Clara Oswald", Black Border)

Cards Outside the Battlefield become Copies

(P) Bombardment - Transform your into Missiles.
(P) Transcantation - Transform spell on the stack.

Card Becomes Another Card's Back Face

(P) Blurry Visionary - Turn two cards into MDFC.
(P) Werewhat - Makes another creature into its own back face, becomes TDFC.

Arbitrary Names

(P) A Girl and Her Dogs - Name the tokens anything you want.
(Uk) Your Favorite Character - Name of a Magic character. Probably best adapted as picking any string for the name, unless Vorthos (Tier 5) gets added. Rest of it seems possible to script, though complicated.

Rulebreaker

(If this is your commander, loosens color identity or deck building restrictions.)

(Uk) Arvad of the Weatherlight
(Uk) Daxiver, Izzet Electromancer
(Uk) Hadran, Naya Sunseeder
(Uk) Valko Indorian, Researcher
(Uk) The Paradise Bird
(Uk) The Covert Blue Mage

Adjust validity for sacrifices

(Uk) Slobad, Actually Just Fine - Make sacrifice creatures and artifacts interchangable.
(Uk) Dan, Shrewd Trader - Bargain any permanent
(Uk) Stroopwafel Cafe - (Plane) Top card of library, as a food. May be "In Multiple Zones at Once", Tier 4.

Face Down Commanders

(At the Chicago 2024 Unknown Event, games were played with Commanders face down until first played. This could be implemented as a game mode or variant. These cards interact with that mechanic.)

(Uk) Illuminating Detective
(Uk) Educated Detective
(Uk) Demon Detective
(Uk) Aggressive Detective
(Uk) Growing Detective
(See also: "Command From the Shadows", Tier 5)

Change Game Piece Type

Claire D'Loon, Joy Sculptor - Tokens become "Tokens that are also Cards", which count as tokens but can exist outside the battlefield. Mystery Booster apparently has "Token Cards" (See: Time Sidewalk); are those the same thing?
(P) Intangible Vibes - Reminder text suggests this would continue to apply to creatures as they leave the battlefield. Rules text is not written as such. Cancelled out by Claire D'Loon?

Affects Gameplay Trackers

(P) Naturalize 2 - Destroy emblems, monarch, city's blessing, dungeons, day, night, and the initiative. And any future trackers, like Start your Engines.
(Uk) Clear, Fair Magic - Destroys all of those, plus planes, schemes, vanguards, bounties and elite creatures (if those ever get added), or conspiracies.

Augment

(Could possibly use the groundwork laid by Mutate to do these)

Half-Kitten, Half-
Humming-
Rhino-
Half-Shark, Half-
Ninja
Zombified
Half-Orc, Half-
Half-Squirrel, Half-
Monkey-
Multi-Headed
Serpentine
Robo-
Steam-Powered
Bat-

Augment Support

Success!
Teacher's Pet
Clever Combo
Really Epic Punch
Dr. Julius Jumblemorph
Surgeon ~~General~~ Commander

Host Cards

Ordinary Pony
Crafty Octopus
Strutting Turkey

Print Characteristics

(Main complication with these is the golden rule of Un-games, that these characteristics are derived from the printing, not the central Oracle info that normal characteristics use. They may vary from one print to another based on language, edition, or just for stylistic reasons. One permanent can also have multiple sets of these merged into one by something like Grusilda. Only saving grace here keeping this out of Tier 5 is that we could in theory extract most of these from the Scryfall API...)

Super Secret Tech - Premium
Abstract Iguanart - First letter of artist's name
Park Map - Art
Collectigull // Only the Best - Booster Fun
Treizeci, Sun of Serra - Retro Frame
Stet, Draconic Proofreader - First letter of card name, first letter of player's name, and can also delete letters from either.
Topdeck the Halls - Premium, promos, alternate frames, and the vaguely defined "alternate art".
(P) Lutri, Pauper Otter - Color of expansion symbol. Not necessarily synonymous with rarity if counting playtest cards...

Artist Matters

(Forge does keep track of this for most sets.)

Circle of Protection: Art
Drawn Together
Erase (Not the Urza's Legacy One)
Fascist Art Director
Artful Looter
Brushstroke Paintermage
Bursting Beebles
Framed
Greater Morphling - (Also Expansion Symbol Matters)
Aesthetic Consultation
Persecute Artist
Zombie Fanboy
Mana Flair
Graphic Violence
Remodel
Very Cryptic Command A
Ineffable Blessing B
Greatest Show in the Multiverse

Expansion Symbol Matters

Symbol Status
World-Bottling Kit
(Uk) Sixth Stage of Magic Design - Also color of symbol.

Rarity Matters

(Currently tracked by Forge)

Rare-B-Gone
Ineffable Blessing D
Well Done
Lila, Hospitality Hostess

Collector Number Matters

First Come, First Served
Knight of the Kitchen Sink B
Knight of the Kitchen Sink D
Ineffable Blessing E

Name Text Matters

Wordmail
Double Header
Now I Know My ABC's
Bloodletter
When Fluffy Bunnies Attack
Zzzyxas's Abyss
Monkey Monkey Monkey
Urza's Hot Tub
Knight of the Kitchen Sink E
Oddly Uneven
Very Cryptic Command B
Sly Spy A
Ineffable Blessing F
Everythingamajig E
Staff of the Letter Magus
Jetpack Janitor - Alpha strike
Katerina of Myra's Marvels
Knight in _____ Armor - (Also Stickers)
Leading Performance
Main Event Horizon
Busted!
Decisions, Decisions
How is This a Par Three?!
Treacherorus Trapezist
Disemvowel
Gray Merchant of the Alphabet
Aardwolf's Advantage - Alpha strike
Alpha Guard
Angelic Harold - (Also Stickers)
Chea, Friend to Maybe Too Many
(Uk) The Water Maro

Text Box Text Matters

Tainted Monkey
Punctuate
Pygmy Giant
Meddling Kids

Rules Text Matters

capital offense
Nocturno of Myra's Marvels
Third Stage of Magic Design - (Or type line)

Reminder Text Matters

Duh
Old Guard

Flavor Text Matters

Ineffable Blessing A
Plot Armor
Carnivorous Death-Parrot - Does this become an unpayable cost if copied onto a card without flavor text?
(Uk) The Rhystic Storyteller - Also deck can't use sleeves? Could override their card back choice...

Border Color Matters

(Border color is currently supported on an edition level, but not for individual cards. Some cards that use it to look for silver borders have also since been errata'd to include acorns.)

Kinght of the Kitchen Sink A
Ineffable Blessing C

Watermark Matters

Knight of the Kitchen Sink F
S.N.E.A.K. Dispatcher
Very Cryptic Command E - Also border color
"Rumors of My Death..."
Hammerfest Boomtacular
Druid of the Sacred Beaker
Stamp of Approval
Secret Base
Watermarket

Tier 4

Either poorly defined rules, or other logistical complications exist. Often can be figured out case-by-case but general solutions are hard to come up with.

B.F.M. (Big Furry Monster) - Maybe "Can only enter the battlefield simultaneously with its other half," plus a SA to cast them both, plus a replacement that merges them?
S.N.O.T. - Unclear what sticking them together means. Merging permanents perhaps?
Graveyard Busybody - "All graveyards are also your graveyards." (Also Flavor Text Matters)
Over My Dead Bodies - Creatures in graveyards can attack as though they were on the battlefield.
Mary O'Kill - Switching places with another card. Conveys all statuses, like an advanced Ninjutsu? Gets a dozen times more complicated when someone drops Conspiracy and names Killbot.
Proper Laboratory Attire - Identify cards that allow or require die rolls.
Split Screen - Multiple Libraries, choose which one each time you interact with one.
Mobile Clone - Copying the physically visible characteristics and modifiers of a card and baking them into the copy.
Trigger Happy - Trigger an ability. Sounds possible on paper, and rulings cover a lot of edge cases. May just have to try it and see if it breaks.
Icing Manipulator - +1/+1 counters are also food tokens. Not even sure how the UI for this would even work. Summon in food tokens to represent them, then add or remove them in lockstep with the counters B.O.B. style?
Log Flume - (Attraction) Creatures in a log together can't be blocked unless they're all blocked, and spells that target one of them target all of them.
(P) Stack of Paperwork - Combat damage uses the stack.
(P) Animate Spell - Enchants a spell on the stack, turns it into a creature.
(P) Queue of Beetles - Turns Stack into a FIFO queue.
(P) Seasoned Weaponsmith - Creature can be attacked directly
(P) Interplanar Brushwagg - Neutral creature that attacks on its own.
(P) Soulmates - "Enchant two creatures"
(P) Louvaq, the Aberrant - Different, more complicated definition of "Modified" in its reminder text. Unclear if this should be overwritten by game rules. If so, would fall into Tier 1.
(P) Pithing Spyglass - Remove ability words and their corresponding abilities. Could possibly search for them in a trigger or ability description?
Elusen, the Giving - "Whenever a player donates a permanent to another player". Whenever a spell or ability they control would give a permanent they control to another player?
(P) Brigid, Who's Seen Some Stuff - Unsure if granting a keyword that grants keywords creates a dependency or layering issue. Also Nimble keyword.
(Uk) Chancellor of the Mulligan - Mulligan as an action mid-game. Unclear if this should be affected by format's mulligan rules, or its interaction with Serum Powder.
(Uk) The Beleaguered Boxer - Would need special handling in the deck editor, turning a constructed deck into sealed, preventing future editing, then modifying it from in game. Complicated but not impossible.
(P) Terry Pin, Turboturtle - Unclear if this includes keywords like Equip, or just when those exact words are printed in the ability text.
(Uk) The Zonian Brawler - "Bite" effects matter. (Also Rulebreaker, Tier 3)

Rerolling Dice (using the stack)

(Would probably be best to approximate these as static abilities)

Goblin Bookie - Also reflip coin.
Pippa, Duchess of Dice
Scooch - Even the rulings have no idea how this works.

Between Games

(Effects across multiple games of the same match is straightforward enough. Ideally could include rematches with adventure enemies or similar. Rematches in custom matches however gets iffy - what makes an AI the same individual? Name? Avatar? Human opponents can pose similar problems, and tracking this across different hosts becomes complicated.)

Double Dip
Double Take
Double Cross
Double Deal
Double Play
Ghazban Ogress - Number of games won today
Gus - Win streak against player
Time Machine

Converting Counters

(Move a counter, and convert it based on the destination's rules text and/or card types.)

Giant Fan
Everythingamajig A

Swap Player Places

(Exact implementations of these two would be straightforward. However, the FAQ for Unglued and the rulings of the latter suggest that these should swap more than what's described on the card.)

Mirror Mirror
Everythingamajig F

Lookahead

Ambiguity - Reacts to counterspells or permanents that would enter with counters.
Mishra's Toy Workshop - Generates mana for token-creating abilities.
(Uk) The Countering Runner - Discounts spells that would counter things. (Also "Psychic Damage") (Also "Ready to Run", Tier 2)

Memory

(The AI for "accidentally" forgetting certain bits of info is a bit weird conceptually but not impossible)

Squirrel Farm
My First Tome
Everythingamajig D
Memory
Common Courtesy - Remembering to ask permission. Possibly implement "Asking" by clicking on Common Courtesy between casting and passing priority?
(Uk) The Trivia Mastermind
(Uk) The Actualizer

Attack Active Player

Party Crasher - Attacks during opponent's combat phase.
Evil Presents - Attacks own controller.

In Multiple Zones at Once

Yet Another Aether Vortex
Masterful Ninja

Time

(Can use the system clock, but the question is which player's clock to use when online)

Elvish House Party
Old-Fashioned Vampire - Does isitdarkoutside.com have an API?
Syr Cadian, Knight Owl
Spirit of the Season - Season of the year. Shifts the complication from timezones to regional calendars...
Some Disassembly Required - "If it's December", also distributing keyword abilities.
(Uk) May of the Machine - Checks if today is May 6th or May 7th.

Instant Creature

(P) Visitor from Planet Q
(P) Lightning Colt

Animate Zone

(Attaching an enchantment to a zone is a bit weird. The resulting creature in these cases doesn't seem to be all that complicated to handle in most cases, but some weird edge cases exist, especially with un-cards.)

Animate Library
Animate Graveyard

Knock-on Effects

(Cards that alter the existing game rules to work as written, and whose changes would influence black-border interactions. Could have a game flag to decide whether or not to use un-rules.)

Super-Duper Death Ray - Trample on an instant. Very similar to Flame Spill but nuances of it being a keyword need to be investigated. Option to assign more damage to target?
(P) Glade of the Pump Spells - Land with mana cost. Do-able on its own, but may have a knock-on effect for other cards.
(P) Madlands - Land with Madness. Played as a land drop when madness cost is paid.
(P) Value Town // Take a Trip to... - Adventure on a Land. Unsure if there's a way to cast a land as an Adventure in black border.

Share attachment effects

(Could possibly get 90% there with a static ability meddling with EquippedBy or AttachedBy, but plenty of edge cases out there.)

Solaflora, Intergalactic Icon - Equipment, Auras, plus counters and stickers.
(Uk) The Kami Knight - Just Equipment. (Also "Can't be Goaded")

Make things into Planeswalkers without Loyalty Counters

(P) Abian, Luvion Usurper - You become a planeswalker, with your life as loyalty counters. B.O.B. style link again?
(P) Planeswalkerificate - Creature becomes a planeswalker with loyalty and toughness tied together. Unclear how it works with other toughness modifying effects.

Alters Counting

(P) Five Kids in a Trenchcoat - Counts as five creatures when counting creatures.
(Uk) The Multiplayer Nitpickers - Effects that count players see an extra one.

Tier 5

Theoretically possible to do digitally, but in practice there is no good way to do these in Forge

R&D's Secret Lair - Would have to maintain separate cardscripts for every print that functions differently.
Vorthos, Steward of Myth - Named character, appearing in art, name, or flavor text. Besides the art (see Art Elements below), would need the list of named characters and any variants of their name to look for.
Spelling Bee - Beyond the issues of "Text Matters" from Tier 3 and "Memory" from Tier 4, the biggest issue here is prompting a player to spell a word without showing them how to spell the word. Would need a Text-to-speech implementation.
(Uk) Hero's Uncle - Tutors legendary team up cards. List is short enough to hard code but having to maintain it would not be ideal.
(Uk) Minnea, Planar Tourist - Choose a plane, affects cards from chosen plane. Tagger has planes for artwork and character origins. That might cover enough?
(Uk) Command From The Shadows - Conspiracy that keeps commanders hidden until first played. Problem is we show commanders in the lobby before the game even starts. Could be its own separate game mode.

Noninteger Numbers

Bosom Buddy
Little Girl
Flaccify
Cheap Ass
Smart Ass
Bad Ass
Dumb Ass
Fat Ass
Assquatch
Necro-Impotence
Wet Willie of the Damned
Mons's Goblin Waiters
Saute
Fraction Jackson
Supersize
Letter Bomb
Mox Lotus
City of Ass
Infinity Elemental
Just Desserts
Octo Opus
Omniclown Colossus // Pie-roclasm
Urza's Fun House

NonWUBRG Colors

(These could be done colorless like Sword of DnD)

Water Gun Balloon Game - Pink token (Also "Pop!" counters)
Gift Shop - Pink token, (Also Attraction and Stickers)
Push Your Luck - Pink token

Number or Text Adjustment

(There's no direct link between numbers within the text and numbers used in the script.)

Look at Me, I'm R&D
Magical Hacker
More or Less
Very Cryptic Command F
Truss, Chief Engineer
(Uk) You, Magic Playtester

Count Lines of Text

(Scryfall doesn't seem to carry this info.)

Lexivore
Frazzled Editor - Wordy (4+ lines of rules text)
Garbage Elemental A - Wordy
Alexander Clamilton - Wordy
Hardy of Myra's Marvels - Flavor Text
Meet and Greet "Sisay" - Flavor Text (Also Expansion Symbol Matters)
(Uk) Clamilton Estate - Wordy

Art Rampage

Our Market Research Shows That Players Like Really Long Card Names So We Made this Card to Have the Absolute Longest Card Name Ever Elemental
Garbage Elemental E

Art Elements

(If Scryfall included tagger tags in their API, these could go up to tier 3)

Knight of the Kitchen Sink C
Sly Spy B
Sly Spy D
Selfie Preservation
Acornelia, Fashionable Filcher
Don't Try This at Home
Ignacio of Myra's Marvels
Nightmare Moon - (Also, Friendship)
Pinkie Pie

Art Elements, (unsupported by tagger)

Bar Entry - Head above the bar in Bar Entry's art.
Jermane, Pride of the Circus - Four or more legs.
Assembled Ensemble - "artifact creature in its art"; could possibly cross together a bunch of other tags for artificial creature types.

Hat Wearing

(Tagger's "Hat" tag doesn't exactly fit this. Per ruling: "The creature that the card represents must be wearing a hat to have menace. A background character or a scale bird wearing a hat wouldn’t count." Could ignore that caveat and have it fit for the majority of cases though.)

Goblin Haberdasher
Hat Trick
Park Re-Entry
T.A.P.P.E.R.
Haberthrasher
Rat in the Hat
Goblin Girder Gang

Arbitrary Words

(Cards where to apply the rules, we'd need to maintain a list of all words in the player's language, because the AI doesn't know to complain if a player chooses "qwxbzrkl")

Goblin Cruciverbalist
Hangman - Guessing letters of a word is the easy part. Getting the AI to play along is harder.

Time Limits

(Interacting with the Forge UI under time pressure will not be a fun experience for anyone. The AI being able to do it instantly just throws salt in the wound.)

Hot Fix
Modular Monstrosity
Scavenger Hunt - (Attraction)
Trivia Contest - (Attraction)

Unknown Event Scoring

(At the Philadelphia 2023 Unknown Event, players were split into two teams. These cards, when played, scored points for your team. The whole event would have to be recreated for these to be relevant.)

(Uk) Good Knight
(Uk) Point to the Scoreboard
(Uk) Bad Knight
(Uk) Join the Winning Team
(Uk) Snapsail Rider - Affects point value for the surrounding match
(Uk) Take the High Ground

Unknown Event Meta-game Planes

(At the Minneapolis 2023 Unknown Event, Planechase-like planes were in effect across all games in the event. Some of these could be implemented as normal Planechase cards, but the ones here would not translate well.) (These currently aren't on Scryfall)

(Uk) The Library - Starting hand size.
(Uk) Yargle's Barge - Once per game activation.
(Uk) The Underworld - Once per game may-cast.
(Uk) Wizards of the Coast - Once per game may-cast. (Also Playtest Card matters, Tier 2)

Universes Beyond Setting

(Think tagger tags could support this)

Byode, Inverse Sun
(Uk) Multiversal High Council - (Plane) Number of unique universes

Tier 6

Could at best do a rough imitation, partial implementation, or would require its own minigame to work digitally

Sorry
Jalum Grifter
Frankie Peanuts
Cramped Bunker
Boomstacker
Devil K. Nevil
Tchotchke Elemental
Cover the Spot - (Attraction)
Squirrel Stack - (Attraction)
Chaos Wrap
Nerf War
Goblin Mime - Triggered by any dialog. Could at least watch for other dialog-costs being paid.
Phone a Friend - Could just be randomly chosen and/or let the opponent choose?
Yule Ooze - Could change the cost from eating food to sacrificing a Food to keep the spirit of the card, but that is a rules change.
Fluttershy - Stare down could be implemented as a designation. But even so, "creature with a tail" would make this at best a Tier 5.
The Secret Lair - Can't implement accurately without knowing the secret word.
Autograph Book - Collect signatures from opponents? Adventure enemies? (Also Legacy, Tier 3.)
(Uk) The Clever Magician - Proposing a rule. Could cover a lot of ground functionally by just opening a text editor and letting them write their rule as a card script, to apply through an effect. UX for that implementation would be a lost cause though, and the AI would never be able to evaluate it.
(Uk) At Least It's a Dry Heat - Even without the geolocation needed to determine "sources on the east coast", tracking the causality of damage events through numbers would be Tier 4 at best.
(Uk) Drive to Work - Sharing fun facts about cards.

Dexterity; tossing cards at other cards

Landfill
Chaos Confetti
Slaying Mantis
Knife and Death
Dart Throw - (Attraction)
Goblin Sleigh Ride
Ol' Buzzbark - Dice, not cards, but similar in principle.
(See also: "Chaos Orb" and "Falling Star", Black Border)

Dexterity; spin a card

(Could simulate similar to Chaos Orb, would work better than a lot of others.)

Pointy Finger of Doom
(Uk) Windmill Farm - (Plane)

Yes or No Questions about cards

Head to Head
(Uk) Guess Who it Is!

Sneak onto Battlefield

Cheatyface
Entirely Normal Armchair
Surprise Party

Placement of Stickers within Art

Astroquarium
Juggletron

Toys

(Could provide a pre-defined pool of these)

Applejack
Rarity
Grimlock, Dinobot Leader // Grimlock, Ferocious King - Also looks for Transformers creatures.

Tier 7

Impossible in a rules engine, no good way to approximate it.

Blufferfish
D00-DL, Caricaturist
Photo Op - Due to restrictions on Twitter's API, this sadly can't go in Tier 5.
(Uk) Windy City Elemental
(Uk) Sharp Eraser

Surrounding Room

Sex Appeal
Now You See Me...
Super-Duper Lost
Questionable Cuisine
Amped Up
Mistakes Were Made

Clothing Matters

Prismatic Wardrobe
Hurloon Wrangler
Ladies' Knight
"Brims" Barone, Midway Mobster
Souvenir T-Shirt
The Big Top
(Uk) Pin Collector's Booth - (Plane)
(Uk) Pin Trading - (Phenomenon)

Dialog

(Stuff that involves table chat, or just doesn't work in spirit if converted to a zero cost)

I'm Rubber, You're Glue
Censorship
Clam Session
Ow
Bronze Calendar
Atinlay Igpay
Loose Lips
Question Elemental?
Goblin S.W.A.T. Team - (Also time limits)
Red-Hot Hottie
Keeper of the Sacred Word
Land Aid '04
Stone Cold Basilisk
Toy Boat
Rings a Bell
Bog Humbugs
Seasonal Sequels
(Uk) High Noon At Thunder Junction - (Plane)

Gotcha Cycle

Cardpecker
Save Life
Number Crunch
Spell Counter
Kill Destroy
Stop That
Deal Damage
Touch and Go
Creature Guy
Laughing Hyena
Name Dropping

Physical Actions

Standing Army
Charm School
Bureaucracy
Volrath's Motion Sensor
Clay Pigeon
Phyrexian Librarian
Vile Bile
Mouth to Mouth
Eye to Eye
Side to Side
Hazmat Suit (Used)
Hoisted Hireling
Skull Saucer
Form of the Approach of the Second Sun
Get Your Head in the Game
Plate Spinning
(Uk) Shrinking Plane - (Plane)

Food and Drink

Ashnod's Coupon
Thopter Pie Network
Eggnogger's 'Stache

Player Characteristics

Man of Measure
Avatar of Me - (Also NonWUBRG colors)
Moniker Mage
Granny's Payback
Blurry Beeble

Physical Hands Matter

Deadhead
Handcuffs
Farewell to Arms
Working Stiff
Gluetius Maximus
Sly Spy C
Handy Dandy Clone Machine
A Real Handful

Signatories Matter

(Uk) The Collector
(Uk) Mark Ritual

People Outside the Game

(Solutions involving ChatGPT are probably non-starters...)

Gimme Five
Sacrifice Play
Defective Detective
Subcontract
It That Gets Left Hanging
Squirrel Dealer
Flavor Judge
Gobsmacked
Bag Check
Focused Funambulist
Art Appreciation
Carnival Barker
Rock Star
Ticking Mime Bomb
Pietra, Crafter of Clowns
Blue Ribbon
Guess Your Fate - (Attraction)
The Superlatorium - (Attraction)
(Uk) The Knight of Commentary
(Uk) Fifth Stage of Magic Design

Commemorative Celebration Cards

(The rules engine is not licensed to officiate marriages.)

Proposal
Splendid Genesis
Fraternal Exaltation
Pheonix Heart

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