Mikaeus, the Unhallowed

a Zombie enters the battlefield — 509 cards in Mikaeus's colors can cause this (Mikaeus is one).

When Mikaeus, the Unhallowed enters:

1. Noxious Ghoul — shrinks a creature by -1/-1
2. Champion of the Perished — puts a +1/+1 counter on itself

a permanent is put into a graveyard from the battlefield — 1,852 cards in Mikaeus's colors can cause this (Mikaeus is one).

1. Vincent Valentine // Galian Beast — When a Human dies thanks to Mikaeus, the Unhallowed, Vincent Valentine // Galian Beast puts that creature's power +1/+1 counters on itself

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

a card in a graveyard — 2,555 cards in Mikaeus's colors can cause this (Mikaeus is one).

1. Heart-Shaped Herb — Mikaeus, the Unhallowed puts cards into the graveyard that Heart-Shaped Herb can bring back
2. Tergrid, God of Fright // Tergrid's Lantern — Mikaeus, the Unhallowed puts cards into the graveyard that Tergrid, God of Fright // Tergrid's Lantern can bring back
3. Dauthi Voidwalker — Cards Mikaeus, the Unhallowed would put into an opponent's graveyard are exiled by Dauthi Voidwalker instead, and it can play from among them
4. Thieves' Guild Enforcer — Mikaeus, the Unhallowed fills an opponent's graveyard toward the 8 or more cards Thieves' Guild Enforcer needs
5. Reito Sentinel — Mikaeus, the Unhallowed puts cards into the graveyard that Reito Sentinel can bring back
6. Szarekh, the Silent King — Mikaeus, the Unhallowed puts cards into the graveyard that Szarekh, the Silent King can bring back
7. Chrome Companion — Mikaeus, the Unhallowed puts cards into the graveyard that Chrome Companion can bring back
8. Ashnod's Intervention — Mikaeus, the Unhallowed puts cards into the graveyard that Ashnod's Intervention can bring back
9. Phyrexian Archivist — Mikaeus, the Unhallowed puts cards into the graveyard that Phyrexian Archivist can bring back
10. Relic Golem — Mikaeus, the Unhallowed fills an opponent's graveyard toward the 8 or more cards Relic Golem needs

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

anything goes to a graveyard — 2,555 cards in Mikaeus's colors can cause this (Mikaeus is one).

When a Human hits the graveyard thanks to Mikaeus, the Unhallowed:

1. The Haunt of Hightower — puts a +1/+1 counter on itself
2. Bloodchief Ascension — makes each opponent lose 2 life
3. Planar Void — hits a graveyard

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

a creature attacks — 3,478 cards in Mikaeus's colors can cause this (Mikaeus is one).

When Mikaeus, the Unhallowed attacks:

1. Adaptive Omnitool — searches a library
2. Chorale of the Void — brings a card back
3. Staff of Titania — makes a token
4. Inquisitorial Rosette — makes a token
5. Wand of Orcus — grants deathtouch
6. Andúril, Flame of the West — makes 2 tokens
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. Throwing Knife — sacrifices itself

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

anything attacks — 3,478 cards in Mikaeus's colors can cause this (Mikaeus is one).

When Mikaeus, the Unhallowed attacks:

1. Grim Javelineer — gives +1/+0
2. ED-E, Lonesome Eyebot — puts a quest counter on itself
3. Fire Navy Trebuchet — makes a token
4. Stensian Sanguinist // Exsanguinate — grants deathtouch
5. Rev, Tithe Extractor — grants deathtouch
6. Boggart Prankster — gives +1/+0
7. Within Range — makes each opponent lose life
8. Curse of Disturbance — makes a token
9. Dawnsire, Sunstar Dreadnought — deals 100 damage
10. Twins of Discord — triggers

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

a creature blocks — 3,478 cards in Mikaeus's colors can cause this (Mikaeus is one).

When Mikaeus, the Unhallowed blocks:

1. Mage Hunters' Onslaught — makes a player lose 1 life
2. Barrow-Blade — strips abilities
3. Dead-Iron Sledge — kills a creature

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

a creature it boosts — 3,801 cards in Mikaeus's colors can cause this (Mikaeus is one).

Mikaeus, the Unhallowed gives:

1. Canoptek Spyder — bigger stats
2. Brainstealer Dragon — bigger stats
3. Defiler of Flesh — bigger stats
4. Traxos, Scourge Eternal — bigger stats
5. Ayara, First of Locthwain — bigger stats
6. Glaring Fleshraker — bigger stats
7. Snarling Gorehound — bigger stats
8. Soultether Golem — bigger stats
9. Poisonbelly Ogre — bigger stats
10. Wretched Anurid — bigger stats

3,790 other cards care about it too. These are the ones with the most connections.

a creature it grants abilities to — 3,801 cards in Mikaeus's colors can cause this (Mikaeus is one).

Mikaeus, the Unhallowed gives:

1. Blood Seeker — undying
2. Shadow Alley Denizen — undying
3. Madame Null, Power Broker — undying
4. Gluttonous Slug — undying
5. Ambuscade Shaman — undying
6. Eldrazi Mimic — undying
7. Orc Sureshot — undying
8. The Peregrine Dynamo — undying
9. Abstruse Archaic — undying
10. Straw Golem — undying

3,790 other cards care about it too. These are the ones with the most connections.