Blood Seeker 
Creature — Vampire Shaman
$0.22 #2710 0.27 17.0 years
Whenever a creature an opponent controls enters, you may have that player lose 1 life.
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Cards similar to Blood Seeker expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Poisonbelly Ogre96%
$0.07↓#28307↓0.2220.7 years↑
"Whenever another creature enters, its controller loses 1 life."
Corpse Knight90%
$0.34↑#1436↑0.317.3 years↓
"Whenever another creature you control enters, each opponent loses 1 life."
Suture Priest88%
$1.58↑#1148↑0.51↑15.4 years↓
"Whenever a creature an opponent controls enters, you may have that player lose 1 life."
Wretched Anurid86%
$0.15↓#11395↓0.14↓24.0 years↑
"Whenever another creature enters, you lose 1 life."
Maggot Carrier79%
$0.17↓#22894↓0.13↓25.7 years↑
"When this creature enters, each player loses 1 life."
Poison-Tip Archer78%
$0.60↑#1681↑0.348.3 years↓
"Whenever another creature dies, each opponent loses 1 life."
Blood-Toll Harpy78%
$0.03↓#28747↓0.07↓13.1 years↓
"When this creature enters, each player loses 1 life."
Howling Banshee78%
$0.07↓#25191↓0.05↓17.3 years
"When this creature enters, each player loses 3 life."
Rabid Bloodsucker78%
$0.09↓#27604↓0.00↓11.3 years↓
"When this creature enters, each player loses 2 life."
Trespasser's Curse76%
$0.33↑#5175↓0.53↑9.5 years↓
"Whenever a creature enchanted player controls enters, that player loses 1 life and you gain 1 life."
Grim Guardian76%
$0.33↑#3403↓0.1812.5 years↓
"Whenever this creature or another enchantment you control enters, each opponent loses 1 life."
Rampaging Ferocidon76%
$1.79↑#26500.64↑9.1 years↓
"Whenever another creature enters, this creature deals 1 damage to that creature's controller."
Thunder of Unity75%
$0.24↑#9750↓0.00↓1.5 years↓
"Whenever a creature you control enters this turn, each opponent loses 1 life and you gain 1 life."
Obyra, Dreaming Duelist75%
$0.32↑#3436↓0.193.1 years↓
"Whenever another Faerie you control enters, each opponent loses 1 life."
Pierce Strider74%
$0.06↓#23268↓0.00↓15.7 years↓
"When this creature enters, target opponent loses 3 life."
Flayer Drone73%
$0.23↑#19184↓0.3510.7 years↓
"Whenever another colorless creature you control enters, target opponent loses 1 life."
Soultether Golem73%
$0.20↓#27192↓0.06↓19.5 years↑
"Whenever another creature you control enters, put a time counter on this creature."
Jaws of Defeat72%
$0.92↑#4206↓0.321.5 years↓
"Whenever a creature you control enters, target opponent loses life equal to the difference between that creature's power and its toughness."
Vicious Conquistador72%
$0.28↑#9084↓0.11↓9.1 years↓
"Whenever this creature attacks, each opponent loses 1 life."
Pulse Tracker72%
$0.13↓#9941↓0.12↓16.7 years
"Whenever this creature attacks, each opponent loses 1 life."