Bookwurm

hits creature — 2,298 cards in the game can cause this (Bookwurm is one).

1. Jalira, Master Polymorphist — Jalira, Master Polymorphist can put Bookwurm onto the battlefield from your library
2. Kethek, Crucible Goliath — Kethek, Crucible Goliath can put Bookwurm onto the battlefield from your library
3. Polymorph — Polymorph can put Bookwurm onto the battlefield from your library
4. Birthing Ritual — Birthing Ritual can put Bookwurm onto the battlefield from your library
5. Industrial Advancement — Industrial Advancement can put Bookwurm onto the battlefield from your library
6. Killer Instinct — Killer Instinct can put Bookwurm onto the battlefield from your library
7. Arthur, Marigold Knight — Arthur, Marigold Knight can put Bookwurm onto the battlefield from your library
8. Proteus Staff — Proteus Staff can put Bookwurm onto the battlefield from your library
9. Synthetic Destiny — Synthetic Destiny can put Bookwurm onto the battlefield from your library
10. Divergent Transformations — Divergent Transformations can put Bookwurm onto the battlefield from your library

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

a creature leaves a graveyard — 1,302 cards in the game can cause this (Bookwurm is one).

When Bookwurm leaves a graveyard:

1. Grim Reaper's Scythe — makes a token
2. Syr Konrad, the Grim — deals 1 damage
3. Cyan, Vengeful Samurai — puts a +1/+1 counter on itself
4. Along the Crooked Way — puts a counter on a Goblin or Army
5. Skeleton Crew — makes a token
6. Desecrated Tomb — makes a token
7. Chalk Outline — makes a token
8. Insidious Roots — makes a token
9. Undead Hand Ninja — makes each opponent lose 1 life
10. Erebos's Titan — triggers

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

life is gained — 2,076 cards in the game can cause this (Bookwurm is one).

When Bookwurm gains life:

1. Dina, Soul Steeper — makes each opponent lose 1 life
2. Marina Vendrell's Grimoire — draws you that many cards
3. South Wind Avatar — makes each opponent lose 1 life
4. Rodolf Duskbringer — grants indestructible
5. Fiendish Panda — puts a +1/+1 counter on itself
6. Veinwitch Coven — brings a card back
7. Cleric Class — puts a counter on a creature
8. Lich's Mastery — draws you that many cards
9. Wall of Limbs — puts a +1/+1 counter on itself
10. Ratchet, Field Medic // Ratchet, Rescue Racer — triggers

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

anything leaves a graveyard — 2,503 cards in the game can cause this (Bookwurm is one).

When Bookwurm leaves a graveyard:

1. Blastoneuron — makes each opponent lose 1 life
2. Defiled Crypt // Cadaver Lab — makes a token
3. Teval, the Balanced Scale — makes a token
4. Hologram Stalker — makes a token
5. Tormod, the Desecrator — makes a token
6. Quintorius, Field Historian — makes a token
7. Garrison Excavator — makes a token
8. Amzu, Swarm's Hunger — makes a token
9. Kirol, History Buff // Pack a Punch — becomes prepared
10. Teval's Judgment — triggers

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

a card is drawn — 3,815 cards in the game can cause this (Bookwurm is one).

When Bookwurm makes a player draw a card:

1. Temmet, Naktamun's Will — gives +1/+1
2. Niv-Mizzet, Parun — deals 1 damage
3. Aether Syphon — mills a card
4. The Locust God — makes a token
5. Starving Revenant — makes each opponent lose 1 life
6. Diviner's Wand — gets +1/+1
7. Ominous Seas — puts a foreshadow counter on itself
8. Dream Trawler — gets +1/+0
9. Iron Man, Armored Avenger — puts a counter on a creature
10. The Astonishing Ant-Man — puts a +1/+1 counter on itself

57 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 (Bookwurm is one).

When Bookwurm attacks:

1. Far Fortune, End Boss — deals 1 damage
2. Invisible Woman — triggers
3. Caesar, Legion's Emperor — sacrifices a creature
4. Guide of Souls — triggers

125 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 (Bookwurm is one).

When Bookwurm attacks:

1. Adaptive Omnitool — searches a library
2. Saw — sacrifices a creature

190 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 (Bookwurm is one).

When Bookwurm enters:

1. Slash, Reptile Rampager — deals 2 damage
2. Ray Fillet, Wave Warrior — puts a counter on itself
3. Aetherstorm Roc — puts a counter on a permanent you control

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

anything enters the battlefield — 26,499 cards in the game can cause this (Bookwurm is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When Bookwurm enters, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself

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