Mercurial Pretender

a nontoken creature leaves the battlefield — 4,133 cards in the game can cause this (Mercurial Pretender is one).

When Mercurial Pretender leaves the battlefield:

1. Tokka & Rahzar, Unsupervised — puts a +1/+1 counter on itself
2. Splinter, the Mentor — makes a token
3. Rat King, Pale Piper — makes a token
4. Dual Nature — exiles a creature

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

When Mercurial Pretender leaves the battlefield:

1. Lunarch Veteran // Luminous Phantom — gains you 1 life
2. Extractor Demon — mills a card
3. Aang, Airbending Master — puts a counter on a permanent
4. Dour Port-Mage — draws you 1 card
5. Vela the Night-Clad — makes each opponent lose 1 life
6. Taeko, the Patient Avalanche — scries
7. Ninth Bridge Patrol — puts a +1/+1 counter on itself
8. Funeral March — makes a player sacrifice a creature
9. Sally Sparrow — triggers
10. Aang, at the Crossroads // Aang, Destined Savior — triggers

21 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 (Mercurial Pretender is one).

When Mercurial Pretender attacks:

1. Shaun, Father of Synths — makes a token
2. Far Fortune, End Boss — deals 1 damage
3. Temmet, Naktamun's Will — draws you 1 card
4. Grim Javelineer — gives +1/+0
5. Invisible Woman — triggers
6. Caesar, Legion's Emperor — sacrifices a creature
7. Guide of Souls — triggers
8. Campsite Cuisine — sacrifices a Food
9. Gossip's Talent — triggers
10. Banon, the Returners' Leader — draws and discards

112 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 (Mercurial Pretender is one).

When Mercurial Pretender attacks:

1. Adaptive Omnitool — searches a library
2. Anthem of Rakdos — gives +2/+0
3. Kindred Discovery — draws you 1 card
4. Invasion of New Capenna // Holy Frazzle-Cannon — puts counters on a permanent
5. Chorale of the Void — brings a card back
6. Anim Pakal, Thousandth Moon — puts a +1/+1 counter on itself
7. Saw — sacrifices a creature
8. Gisa's Favorite Shovel — makes an opponent sacrifice a creature
9. Ultima Weapon — kills a creature an opponent controls
10. Total War — kills a creature

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

a creature blocks — 17,934 cards in the game can cause this (Mercurial Pretender is one).

When Mercurial Pretender blocks:

1. Mage Hunters' Onslaught — makes a player lose 1 life
2. Tide of War — sacrifices a creature
3. Dead-Iron Sledge — kills a creature
4. Dwindle — kills a creature

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

a creature deals combat damage — 17,934 cards in the game can cause this (Mercurial Pretender is one).

1. Primo, the Unbounded — When Mercurial Pretender deals combat damage, Primo, the Unbounded makes a token

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

a nontoken creature attacks — 17,934 cards in the game can cause this (Mercurial Pretender is one).

1. Mardu Ascendancy — When Mercurial Pretender attacks, Mardu Ascendancy makes a token

2 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 (Mercurial Pretender is one).

1. Champions of the Perfect — When Mercurial Pretender is cast, Champions of the Perfect draws you 1 card

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 (Mercurial Pretender is one).

1. Fire Nation Salvagers — When Fire Nation Salvagers enters because Mercurial Pretender copies it, its ability triggers again
2. Goblin Goliath — When Goblin Goliath enters because Mercurial Pretender copies it, its ability triggers again
3. Slash, Reptile Rampager — When Mercurial Pretender enters, Slash, Reptile Rampager deals 2 damage
4. The Neutrinos — When Mercurial Pretender enters, The Neutrinos gets +1/+0
5. Wingnut, Bat on the Belfry — When Mercurial Pretender enters, Wingnut, Bat on the Belfry grants flying, haste and menace
6. Shadow Puppeteers — When Shadow Puppeteers enters because Mercurial Pretender copies it, its ability triggers again
7. Tenured Inkcaster — When Tenured Inkcaster enters because Mercurial Pretender copies it, its ability triggers again
8. Aetherstorm Roc — When Aetherstorm Roc enters because Mercurial Pretender copies it, its ability triggers again
9. Raphael, Most Attitude — When Mercurial Pretender enters, Raphael, Most Attitude exiles a card from your library
10. Clandestine Meddler — When Clandestine Meddler enters because Mercurial Pretender copies it, its ability triggers again

295 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 (Mercurial Pretender is one).

1. Zenos yae Galvus // Shinryu, Transcendent Rival — When Zenos yae Galvus // Shinryu, Transcendent Rival enters because Mercurial Pretender copies it, its ability triggers again
2. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When Mercurial Pretender enters, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself
3. Ivora, Insatiable Heir — When Ivora, Insatiable Heir enters because Mercurial Pretender copies it, its ability triggers again
4. Dogmeat, Ever Loyal — When Dogmeat, Ever Loyal enters because Mercurial Pretender copies it, its ability triggers again
5. The Earth King — When The Earth King enters because Mercurial Pretender copies it, its ability triggers again
6. SP//dr, Piloted by Peni — When SP//dr, Piloted by Peni enters because Mercurial Pretender copies it, its ability triggers again
7. Mu Yanling, Wind Rider — When Mu Yanling, Wind Rider enters because Mercurial Pretender copies it, its ability triggers again
8. The Rani — When The Rani enters because Mercurial Pretender copies it, its ability triggers again
9. J. Jonah Jameson — When J. Jonah Jameson enters because Mercurial Pretender copies it, its ability triggers again

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