Phyrexian Hydra

a Phyrexian attacks — 495 cards in the game can cause this (Phyrexian Hydra is one).

1. Vulpine Harvester — When Phyrexian Hydra attacks, Vulpine Harvester brings a card back

a nontoken Phyrexian enters the battlefield — 496 cards in the game can cause this (Phyrexian Hydra is one).

1. Darksteel Splicer — When Phyrexian Hydra enters, Darksteel Splicer makes a token

a Phyrexian enters the battlefield — 524 cards in the game can cause this (Phyrexian Hydra is one).

1. Essence of Orthodoxy — When Phyrexian Hydra enters, Essence of Orthodoxy puts a counter on a permanent

damage is prevented — 568 cards in the game can cause this (Phyrexian Hydra is one).

When Phyrexian Hydra has damage prevented:

1. Phyrexian Vindicator — deals that much damage
2. New Way Forward — deals that much damage
3. Samite Ministration — gains you that much life
4. Judgment of Alexander — deals its power damage

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

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

When Phyrexian Hydra gets a counter:

1. Hollowmurk Siege — draws you 1 card
2. Wickersmith's Tools — puts a charge counter on itself
3. Hapatra, Vizier of Poisons — makes a token
4. Flourishing Defenses — makes a token
5. Nest of Scarabs — makes that many tokens
6. Obelisk Spider — makes each opponent lose 1 life
7. Auntie Ool, Cursewretch — draws you 1 card
8. Generous Patron — draws you 1 card
9. Danny Pink — draws you 1 card
10. Bold Plagiarist — puts counters on a permanent

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 (Phyrexian Hydra is one).

1. All Will Be One — When Phyrexian 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 (Phyrexian Hydra is one).

When Phyrexian 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 (Phyrexian Hydra is one).

When Phyrexian 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. Jolene, Plundering Pugilist — makes a token
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 (Phyrexian Hydra is one).

When Phyrexian 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. Tide of War — sacrifices a creature
6. Dead-Iron Sledge — kills a creature
7. Dwindle — kills a creature
8. Shield of the Righteous — triggers

20 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 (Phyrexian Hydra is one).

When Phyrexian Hydra 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 (Phyrexian Hydra is one).

1. Tifa, Martial Artist — When Phyrexian Hydra deals combat damage, Tifa, Martial Artist untaps a permanent

196 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 (Phyrexian Hydra is one).

When Phyrexian Hydra enters:

1. Scurry Oak — puts a counter on itself
2. Fathom Mage — puts a counter on itself
3. Lonis, Genetics Expert — puts a counter on itself
4. Slash, Reptile Rampager — deals 2 damage
5. Ray Fillet, Wave Warrior — puts a counter on itself
6. The Neutrinos — gets +1/+0
7. Wingnut, Bat on the Belfry — grants flying, haste and menace
8. Aetherstorm Roc — puts a counter on a permanent you control
9. Raphael, Most Attitude — exiles a card from your library

301 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 (Phyrexian Hydra is one).

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

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