Grimoire Thief

a Merfolk in a graveyard — 13 cards in the game can cause this (Grimoire Thief is one).

1. Grim Captain's Call — When Grimoire Thief is in the graveyard, Grim Captain's Call can bring it back

a creature is turned face up — 238 cards in the game can cause this (Grimoire Thief is one).

1. Den Protector — When Den Protector is turned face up thanks to Grimoire Thief, it brings a card back
2. Printlifter Ooze — When Grimoire Thief is turned face up, Printlifter Ooze makes a token
3. Experiment Twelve — When Grimoire Thief is turned face up, Experiment Twelve puts its power counters on a permanent
4. Pyrotechnic Performer — When Grimoire Thief is turned face up, Pyrotechnic Performer deals its power damage
5. Pine Walker — When Grimoire Thief is turned face up, Pine Walker untaps a permanent
6. Fatal Mutation — When Grimoire Thief is turned face up, Fatal Mutation kills it

a Merfolk deals combat damage — 386 cards in the game can cause this (Grimoire Thief is one).

1. Seafloor Oracle — When Grimoire Thief deals combat damage, Seafloor Oracle draws you 1 card

a Merfolk enters the battlefield — 397 cards in the game can cause this (Grimoire Thief is one).

When Grimoire Thief enters:

1. Forerunner of the Heralds — puts a +1/+1 counter on itself
2. Deeproot Elite — puts a counter on a Merfolk
3. River Sneak — gets +1/+1

a Rogue attacks — 636 cards in the game can cause this (Grimoire Thief is one).

1. Soaring Thought-Thief — When Grimoire Thief attacks, Soaring Thought-Thief mills a card

a Rogue deals combat damage — 636 cards in the game can cause this (Grimoire Thief is one).

1. Anowon, the Ruin Thief — When Grimoire Thief deals combat damage, Anowon, the Ruin Thief mills a card

2 other cards care about it too. These are the ones with the most connections.

a Rogue creature enters the battlefield — 657 cards in the game can cause this (Grimoire Thief is one).

1. Cloak and Dagger — When Grimoire Thief enters, Cloak and Dagger triggers

a Rogue enters the battlefield — 659 cards in the game can cause this (Grimoire Thief is one).

1. Thieves' Guild Enforcer — When Grimoire Thief enters, Thieves' Guild Enforcer mills a card

a nontoken creature is sacrificed — 1,714 cards in the game can cause this (Grimoire Thief is one).

When you sacrifice Grimoire Thief:

1. Fumulus, the Infestation — makes a token
2. Bag of Devouring — exiles it

a creature is sacrificed — 1,741 cards in the game can cause this (Grimoire Thief is one).

When you sacrifice Grimoire Thief:

1. Ziatora, the Incinerator — deals that creature's power damage
2. Dina, Essence Brewer — draws you 1 card
3. Fleshtaker — gains you 1 life
4. Body Dropper — puts a +1/+1 counter on itself
5. Smothering Abomination — draws you 1 card
6. Kels, Fight Fixer — draws you 1 card
7. Caesar, Legion's Emperor — triggers
8. Grist, the Hunger Tide — kills a creature or planeswalker an opponent controls
9. Cabal Therapist — triggers
10. Rakdos, the Muscle — exiles a card from an opponent's library

19 other cards care about it too. These are the ones with the most connections.

anything is exiled — 2,497 cards in the game can cause this (Grimoire Thief is one).

1. The War Doctor — When a permanent is exiled thanks to Grimoire Thief, The War Doctor puts a time counter on itself

1 other card cares about it too. These are the ones with the most connections.

a creature in a graveyard — 2,769 cards in the game can cause this (Grimoire Thief is one).

When Grimoire Thief is in the graveyard:

1. Chainer, Dementia Master — can bring it back
2. Thwart the Grave — can bring it back
3. Kami of Restless Shadows — can bring it back
4. Havengul Lich — can bring it back
5. Liliana the Repentant — can bring it back
6. Paleoloth — can bring it back
7. Chainer, Nightmare Adept — can bring it back
8. Banon, the Returners' Leader — can bring it back
9. Surgical Suite // Hospital Room — can bring it back
10. Sword of Light and Shadow — can bring it back

799 other cards care about it too. These are the ones with the most connections.

a nontoken creature dies — 2,769 cards in the game can cause this (Grimoire Thief is one).

When Grimoire Thief dies:

1. Zahur, Glory's Past — makes a token
2. Liesa, Forgotten Archangel — brings a card back
3. Avacyn, Angel of Horror — brings a card back
4. Yedora, Grave Gardener — brings a card back
5. Nim Deathmantle — brings a card back
6. Valkyrie's Call — brings a card back
7. Decaying Soil — brings a card back
8. High-Society Hunter — draws you 1 card
9. Liliana, Heretical Healer // Liliana, Defiant Necromancer — flickers itself
10. Body Launderer — draws and discards

60 other cards care about it too. These are the ones with the most connections.

a creature dies — 2,830 cards in the game can cause this (Grimoire Thief is one).

When Grimoire Thief dies:

1. Pious Evangel // Wayward Disciple — makes each opponent lose 1 life
2. Daxos, Blessed by the Sun — gains you 1 life
3. Elas il-Kor, Sadistic Pilgrim — makes each opponent lose 1 life
4. Shriveling Rot — makes a player lose life equal to its toughness

457 other cards care about it too. These are the ones with the most connections.

a creature leaves the battlefield — 4,238 cards in the game can cause this (Grimoire Thief is one).

1. Ninja Teen — When Grimoire Thief leaves the battlefield, Ninja Teen makes each opponent lose 1 life

34 other cards care about it too. These are the ones with the most connections.

a card in a graveyard — 7,589 cards in the game can cause this (Grimoire Thief is one).

1. Havi, the All-Father — Grimoire Thief fills your graveyard toward the 4 or more cards Havi, the All-Father needs

443 other cards care about it too. These are the ones with the most connections.

anything attacks — 17,934 cards in the game can cause this (Grimoire Thief is one).

When Grimoire Thief attacks:

1. Shaun, Father of Synths — makes a token
2. Grim Javelineer — gives +1/+0

151 other cards care about it too. These are the ones with the most connections.

a creature attacks — 17,934 cards in the game can cause this (Grimoire Thief is one).

1. Chorale of the Void — When Grimoire Thief attacks, Chorale of the Void brings a card back

220 other cards care about it too. These are the ones with the most connections.

a creature is cast — 18,010 cards in the game can cause this (Grimoire Thief is one).

1. God-Eternal Oketra — When Grimoire Thief is cast, God-Eternal Oketra makes a token

90 other cards care about it too. These are the ones with the most connections.

a creature enters the battlefield — 19,800 cards in the game can cause this (Grimoire Thief is one).

When Grimoire Thief enters:

1. Boss's Chauffeur — puts a +1/+1 counter on itself
2. Dinosaur Egg — puts a counter on itself

455 other cards care about it too. These are the ones with the most connections.