Hydromorph Guardian

an Elemental creature in a graveyard — 88 cards in the game can cause this (Hydromorph Guardian is one).

1. Thunderkin Awakener — When Hydromorph Guardian is in the graveyard, Thunderkin Awakener can bring it back

a nontoken Elemental is sacrificed — 90 cards in the game can cause this (Hydromorph Guardian is one).

1. Ashling, the Limitless — When you sacrifice Hydromorph Guardian, Ashling, the Limitless makes a token

an Elemental in a graveyard — 90 cards in the game can cause this (Hydromorph Guardian is one).

When Hydromorph Guardian is in the graveyard:

1. Sunflare Shaman — gets bigger
2. Horde of Notions — can bring it back

an Elemental is put into a graveyard from the battlefield — 93 cards in the game can cause this (Hydromorph Guardian is one).

When Hydromorph Guardian is put into a graveyard from the battlefield:

1. Omnath, Locus of Rage — deals 3 damage
2. Titania, Nature's Force — mills a card

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

When Hydromorph Guardian enters:

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

a nontoken creature is sacrificed — 1,714 cards in the game can cause this (Hydromorph Guardian is one).

When you sacrifice Hydromorph Guardian:

1. Fumulus, the Infestation — makes a token
2. Bag of Devouring — exiles it

a creature is sacrificed — 1,741 cards in the game can cause this (Hydromorph Guardian is one).

When you sacrifice Hydromorph Guardian:

1. Ziatora, the Incinerator — deals that creature's power damage
2. Dina, Essence Brewer — draws you 1 card
3. Fleshtaker — gains you 1 life
4. Body Dropper — puts a +1/+1 counter on itself
5. Smothering Abomination — draws you 1 card
6. Kels, Fight Fixer — draws you 1 card
7. Caesar, Legion's Emperor — triggers
8. Grist, the Hunger Tide — kills a creature or planeswalker an opponent controls
9. Cabal Therapist — triggers
10. Rakdos, the Muscle — exiles a card from an opponent's library

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

a creature in a graveyard — 2,769 cards in the game can cause this (Hydromorph Guardian is one).

When Hydromorph Guardian is in the graveyard:

1. Chainer, Dementia Master — can bring it back
2. Havengul Lich — can bring it back
3. Liliana the Repentant — can bring it back
4. Paleoloth — can bring it back
5. Chainer, Nightmare Adept — can bring it back
6. Banon, the Returners' Leader — can bring it back
7. Surgical Suite // Hospital Room — can bring it back
8. Sword of Light and Shadow — can bring it back
9. Necromantic Thirst — can bring it back
10. Krile Baldesion — can bring it back

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

a nontoken creature dies — 2,769 cards in the game can cause this (Hydromorph Guardian is one).

When Hydromorph Guardian dies:

1. Zahur, Glory's Past — makes a token
2. Liesa, Forgotten Archangel — brings a card back
3. Avacyn, Angel of Horror — brings a card back
4. Yedora, Grave Gardener — brings a card back
5. Nim Deathmantle — brings a card back
6. Valkyrie's Call — brings a card back
7. Decaying Soil — brings a card back
8. High-Society Hunter — draws you 1 card
9. Liliana, Heretical Healer // Liliana, Defiant Necromancer — flickers itself
10. Body Launderer — draws and discards

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

a creature dies — 2,830 cards in the game can cause this (Hydromorph Guardian is one).

When Hydromorph Guardian dies:

1. Pious Evangel // Wayward Disciple — makes each opponent lose 1 life
2. Daxos, Blessed by the Sun — gains you 1 life
3. Elas il-Kor, Sadistic Pilgrim — makes each opponent lose 1 life
4. Shriveling Rot — makes a player lose life equal to its toughness
5. Meathook Massacre II — brings a card back
6. Ashnod's Intervention — brings a card back
7. Saffi Eriksdotter — sacrifices itself
8. Angelic Renewal — sacrifices itself

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

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

1. Ninja Teen — When Hydromorph Guardian leaves the battlefield, Ninja Teen makes each opponent lose 1 life

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

a card in a graveyard — 7,589 cards in the game can cause this (Hydromorph Guardian is one).

1. Havi, the All-Father — Hydromorph Guardian fills your graveyard toward the 4 or more cards Havi, the All-Father needs
2. Repentant Vampire — Hydromorph Guardian fills your graveyard toward the 7 or more cards Repentant Vampire needs
3. Treacherous Vampire — Hydromorph Guardian fills your graveyard toward the 7 or more cards Treacherous Vampire needs
4. Athreos, Shroud-Veiled — When Hydromorph Guardian is in the graveyard, Athreos, Shroud-Veiled can bring it back

440 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 (Hydromorph Guardian is one).

When Hydromorph Guardian attacks:

1. Shaun, Father of Synths — makes a token
2. Grim Javelineer — gives +1/+0
3. Clavileño, First of the Blessed — turns something into a creature

146 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 (Hydromorph Guardian is one).

1. Chorale of the Void — When Hydromorph Guardian attacks, Chorale of the Void brings a card back

221 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 (Hydromorph Guardian is one).

1. Quirion Beastcaller — When Hydromorph Guardian is cast, Quirion Beastcaller puts a +1/+1 counter on itself

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 (Hydromorph Guardian is one).

When Hydromorph Guardian enters:

1. Boss's Chauffeur — puts a +1/+1 counter on itself
2. Dinosaur Egg — puts a counter on itself

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