Blood Seeker

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

When Blood Seeker 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 (Blood Seeker is one).

1. Mavren Fein, Dusk Apostle — When Blood Seeker attacks, Mavren Fein, Dusk Apostle makes a token

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

1. Bloodlord of Vaasgoth — When Blood Seeker is cast, Bloodlord of Vaasgoth grants bloodthirst

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

When Blood Seeker deals combat damage:

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

a Vampire it boosts — 495 cards in the game can cause this.

1. Thirsting Bloodlord — Thirsting Bloodlord gives Blood Seeker bigger stats

494 other cards cause it too. These are the ones with the most connections.

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

When Blood Seeker 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.

1. Captivating Vampire — Captivating Vampire gives Blood Seeker bigger stats
2. Vampire Nocturnus — Vampire Nocturnus gives Blood Seeker bigger stats

501 other cards cause it too. These are the ones with the most connections.

a Shaman creature enters the battlefield — 539 cards in the game can cause this (Blood Seeker is one).

1. Thornbite Staff — When Blood Seeker enters, Thornbite Staff triggers

life is lost — 3,160 cards in the game can cause this (Blood Seeker is one).

When a permanent makes a player lose life thanks to Blood Seeker:

1. Far Fortune, End Boss — raises your speed
2. Zahur, Glory's Past — raises your speed
3. Mendicant Core, Guidelight — raises your speed
4. Aether Syphon — raises your speed
5. Vnwxt, Verbose Host — raises your speed
6. Embalmed Ascendant — raises your speed
7. Slick Imitator — raises your speed
8. Nesting Bot — raises your speed
9. Howlsquad Heavy — raises your speed
10. Hour of Victory — raises your speed

46 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 (Blood Seeker is one).

When Blood Seeker attacks:

1. Temmet, Naktamun's Will — draws you 1 card
2. Grim Javelineer — gives +1/+0
3. Invisible Woman — triggers
4. Caesar, Legion's Emperor — sacrifices a creature
5. Guide of Souls — triggers
6. Campsite Cuisine — sacrifices a Food
7. Gossip's Talent — triggers
8. Banon, the Returners' Leader — draws and discards
9. Toph, Earthbending Master — puts a counter on a permanent
10. Three Dog, Galaxy News DJ — sacrifices an Aura

111 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 (Blood Seeker is one).

When Blood Seeker 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

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 (Blood Seeker is one).

When Blood Seeker 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 (Blood Seeker is one).

When Blood Seeker attacks:

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

a creature it boosts — 19,392 cards in the game can cause this.

1. Vanquisher's Banner — Vanquisher's Banner gives Blood Seeker bigger stats
2. Vibrating Sphere — Vibrating Sphere gives Blood Seeker bigger stats
3. Raiders' Spoils — Raiders' Spoils gives Blood Seeker bigger stats
4. Paragon of Open Graves — Paragon of Open Graves gives Blood Seeker bigger stats
5. Chronicle of Victory — Chronicle of Victory gives Blood Seeker bigger stats
6. Door of Destinies — Door of Destinies gives Blood Seeker bigger stats
7. Infinite Hourglass — Infinite Hourglass gives Blood Seeker bigger stats
8. Icon of Ancestry — Icon of Ancestry gives Blood Seeker bigger stats
9. Caged Sun — Caged Sun gives Blood Seeker bigger stats
10. Gauntlet of Power — Gauntlet of Power gives Blood Seeker bigger stats

19,382 other cards cause it too. These are the ones with the most connections.

a creature it makes cheaper to cast — 19,392 cards in the game can cause this.

1. Heartless Summoning — Heartless Summoning reduces what Blood Seeker costs
2. Herald's Horn — Herald's Horn reduces what Blood Seeker costs
3. Planar Gate — Planar Gate reduces what Blood Seeker costs
4. Urza's Incubator — Urza's Incubator reduces what Blood Seeker costs

19,388 other cards cause it too. These are the ones with the most connections.

a creature it grants abilities to — 19,392 cards in the game can cause this.

1. Corrosive Mentor — Corrosive Mentor gives Blood Seeker wither
2. Filth — Filth gives Blood Seeker swampwalk
3. Echo Circlet — Echo Circlet gives Blood Seeker an extra ability
4. Vanguard's Shield — Vanguard's Shield gives Blood Seeker an extra ability
5. Akroma's Memorial — Akroma's Memorial gives Blood Seeker first strike, flying, haste, protection, trample and vigilance
6. Conspiracy — Conspiracy gives Blood Seeker an extra ability
7. Intimidation — Intimidation gives Blood Seeker fear

19,385 other cards cause it too. These are the ones with the most connections.

a creature it applies speed increase to — 19,392 cards in the game can cause this.

1. Thousand-Year Elixir — Thousand-Year Elixir gives Blood Seeker haste

19,391 other cards cause it too. These are the ones with the most connections.

a creature it applies extra combat to — 19,392 cards in the game can cause this.

1. Swinging Ship — Swinging Ship gives Blood Seeker its extra combat

19,391 other cards cause it too. These are the ones with the most connections.

a creature it grants types to — 19,392 cards in the game can cause this.

1. Amorphous Axe — Amorphous Axe gives Blood Seeker an extra creature type
2. Runed Stalactite — Runed Stalactite gives Blood Seeker an extra creature type

19,390 other cards cause it too. These are the ones with the most connections.

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

When Blood Seeker enters:

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

307 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 (Blood Seeker is one).

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

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