Seahunter

a permanent enters the battlefield — 152 cards in the game can cause this (Seahunter is one).

When a Merfolk enters thanks to Seahunter:

1. Dawn-Blessed Pennant — gains you 1 life
2. Altar of the Brood — mills a card
3. Amareth, the Lustrous — searches a library
4. Rimefire Torque — puts a charge counter on itself
5. Eye of Singularity — kills a permanent

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

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

When a Merfolk enters thanks to Seahunter:

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 Human enters the battlefield — 4,639 cards in the game can cause this (Seahunter is one).

When Seahunter enters:

1. General Kudro of Drannith — hits a graveyard
2. Heronblade Elite — puts a +1/+1 counter on itself
3. Kyler, Sigardian Emissary — puts a +1/+1 counter on itself
4. Thalia's Lieutenant — puts a +1/+1 counter on itself
5. Champion of the Parish — puts a +1/+1 counter on itself
6. Captain of the Mists — untaps itself
7. Erkenbrand, Lord of Westfold — gives +1/+0
8. Beregond of the Guard — gives +1/+1
9. Théoden, King of Rohan — grants double strike
10. Lossarnach Captain — taps a creature an opponent controls

2 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 (Seahunter is one).

When Seahunter attacks:

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

111 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 (Seahunter is one).

When Seahunter 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

181 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 (Seahunter is one).

When Seahunter blocks:

1. Mage Hunters' Onslaught — makes a player lose 1 life
2. Carnage Gladiator — makes a player lose 1 life
3. Barrow-Blade — strips abilities
4. Heat of Battle — deals 1 damage
5. Battle Strain — deals 1 damage
6. Favor of the Woods — gains you 3 life
7. Tide of War — sacrifices a creature
8. Dead-Iron Sledge — kills a creature
9. Dwindle — kills a creature
10. Shield of the Righteous — triggers

18 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 (Seahunter is one).

When Seahunter attacks:

1. Mardu Ascendancy — makes a token
2. Basri Ket — makes a token
3. Militia's Pride — makes a token

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

1. Locutus of Borg — When Seahunter deals combat damage, Locutus of Borg makes a token

197 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 (Seahunter is one).

1. Slash, Reptile Rampager — When a Merfolk enters thanks to Seahunter, Slash, Reptile Rampager deals 2 damage
2. Ray Fillet, Wave Warrior — When Seahunter enters, Ray Fillet, Wave Warrior puts a counter on itself
3. The Neutrinos — When a Merfolk enters thanks to Seahunter, The Neutrinos gets +1/+0
4. Wingnut, Bat on the Belfry — When a Merfolk enters thanks to Seahunter, Wingnut, Bat on the Belfry grants flying, haste and menace
5. Sygg, Wanderwine Wisdom // Sygg, Wanderbrine Shield — When Sygg, Wanderwine Wisdom // Sygg, Wanderbrine Shield enters thanks to Seahunter, it grants a keyword
6. Aetherstorm Roc — When a Merfolk enters thanks to Seahunter, Aetherstorm Roc puts a counter on a permanent you control
7. Raphael, Most Attitude — When a Merfolk enters thanks to Seahunter, Raphael, Most Attitude exiles a card from your library

303 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 (Seahunter is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When a Merfolk enters thanks to Seahunter, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself

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