Vampire Nocturnus

a Vampire attacks — 484 cards in the game can cause this (Vampire Nocturnus is one).

When Vampire Nocturnus attacks:

1. Glass-Cast Heart — makes a token
2. Sanctum Seeker — makes each opponent lose 1 life

a nontoken Vampire attacks — 484 cards in the game can cause this (Vampire Nocturnus is one).

1. Mavren Fein, Dusk Apostle — When Vampire Nocturnus attacks, Mavren Fein, Dusk Apostle makes a token

a Vampire creature is cast — 484 cards in the game can cause this (Vampire Nocturnus is one).

1. Bloodlord of Vaasgoth — When Vampire Nocturnus is cast, Bloodlord of Vaasgoth grants bloodthirst

a Vampire deals combat damage — 484 cards in the game can cause this (Vampire Nocturnus is one).

When Vampire Nocturnus deals combat damage:

1. Rakish Heir — puts a counter on a permanent
2. Stensia Masquerade — puts a counter on a permanent

a Vampire enters the battlefield — 500 cards in the game can cause this (Vampire Nocturnus is one).

When Vampire Nocturnus enters:

1. Anje, Maid of Dishonor — makes a token
2. Forerunner of the Legion — gives +1/+1
3. Markov Enforcer — deals damage
4. Evelyn, the Covetous — exiles a card from a library

a Vampire creature it boosts — 503 cards in the game can cause this (Vampire Nocturnus is one).

Vampire Nocturnus gives:

1. Bloodline Pretender — bigger stats
2. Olivia, Mobilized for War — bigger stats
3. Gladewalker Ritualist — bigger stats
4. Wispdrinker Vampire — bigger stats
5. Welcoming Vampire — bigger stats
6. Blood Seeker — bigger stats
7. Shadow Alley Denizen — bigger stats
8. Ivora, Insatiable Heir — bigger stats

494 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 (Vampire Nocturnus is one).

When Vampire Nocturnus 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

123 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 (Vampire Nocturnus is one).

When Vampire Nocturnus 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

197 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 (Vampire Nocturnus is one).

When Vampire Nocturnus 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

19 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 (Vampire Nocturnus is one).

When Vampire Nocturnus 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 (Vampire Nocturnus is one).

When Vampire Nocturnus deals combat damage:

1. Locutus of Borg — makes a token
2. Antagonist Incorporator — makes a token

215 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 (Vampire Nocturnus is one).

When Vampire Nocturnus enters:

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

375 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 (Vampire Nocturnus is one).

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

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