Mossborn Hydra

an Elemental enters the battlefield — 754 cards in the game can cause this (Mossborn Hydra is one).

When Mossborn Hydra enters:

1. Champion of the Path — deals its power damage
2. Risen Reef — puts a land onto the battlefield

put a land onto the battlefield — 1,560 cards in the game can cause this.

1. Fecund Greenshell — When a land enters thanks to Fecund Greenshell, Mossborn Hydra puts counters on itself
2. The Earth King — When a land enters thanks to The Earth King, Mossborn Hydra puts counters on itself
3. Staff of Titania — When a Forest or Dryad enters thanks to Staff of Titania, Mossborn Hydra puts counters on itself
4. Contaminant Grafter — When a land enters thanks to Contaminant Grafter, Mossborn Hydra puts counters on itself
5. Kodama of the West Tree — When a land enters thanks to Kodama of the West Tree, Mossborn Hydra puts counters on itself
6. Bitterthorn, Nissa's Animus — When a land enters thanks to Bitterthorn, Nissa's Animus, Mossborn Hydra puts counters on itself
7. Sword of the Animist — When a land enters thanks to Sword of the Animist, Mossborn Hydra puts counters on itself
8. Explorer's Scope — When a land enters thanks to Explorer's Scope, Mossborn Hydra puts counters on itself
9. Dragon-Cursed Halls — When Dragon-Cursed Halls enters, Mossborn Hydra puts counters on itself
10. One with Nature — When a land enters thanks to One with Nature, Mossborn Hydra puts counters on itself

1,550 other cards cause it too. These are the ones with the most connections.

a creature gets a counter — 2,691 cards in the game can cause this (Mossborn Hydra is one).

When Mossborn Hydra gets a counter:

1. Hollowmurk Siege — draws you 1 card
2. Ant-Man, Colony Commander — makes a token
3. Earth Kingdom General — gains you that much life
4. Casey Jones, Back Alley Brute — deals that much damage
5. Generous Patron — draws you 1 card
6. Shalai and Hallar — deals that much damage
7. Danny Pink — draws you 1 card
8. Enduring Scalelord — puts a +1/+1 counter on itself
9. Bold Plagiarist — puts counters on a permanent
10. Mikey & Leo, Chaos & Order — draws you 1 card

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

anything gets a counter — 4,415 cards in the game can cause this (Mossborn Hydra is one).

1. All Will Be One — When Mossborn Hydra gets a counter, All Will Be One deals that much damage

8 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 (Mossborn Hydra is one).

When Mossborn Hydra 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

113 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 (Mossborn Hydra is one).

When Mossborn Hydra 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

182 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 (Mossborn Hydra is one).

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

When Mossborn Hydra deals combat damage:

1. Primo, the Unbounded — makes a token
2. Locutus of Borg — makes a token
3. Antagonist Incorporator — makes a token
4. Hive Mind Coprocessor — makes you lose life

193 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 (Mossborn Hydra is one).

When Mossborn Hydra attacks:

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

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

When Mossborn Hydra enters:

1. Slash, Reptile Rampager — deals 2 damage
2. The Neutrinos — gets +1/+0
3. Wingnut, Bat on the Belfry — grants flying, haste and menace
4. Aetherstorm Roc — puts a counter on a permanent you control
5. Raphael, Most Attitude — exiles a card from your library

304 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 (Mossborn Hydra is one).

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

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