Blood Seeker 
Creature — Vampire Shaman
$0.20 #2595 0.27 16.9 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%
$0.05↓#27995↓0.00↓20.6 years↑
"Whenever another creature enters, its controller loses 1 life."
Corpse Knight90%
$0.40↑#1423↑0.287.2 years↓
"Whenever another creature you control enters, each opponent loses 1 life."
Suture Priest87%
$1.51↑#1186↑0.3615.3 years↓
"Whenever a creature an opponent controls enters, you may have that player lose 1 life."
Wretched Anurid86%
$0.15↓#11280↓0.00↓23.9 years↑
"Whenever another creature enters, you lose 1 life."
Maggot Carrier79%
$0.15↓#22542↓0.2425.6 years↑
"When this creature enters, each player loses 1 life."
Poison-Tip Archer78%
$0.54↑#1647↑0.338.1 years↓
"Whenever another creature dies, each opponent loses 1 life."
Blood-Toll Harpy78%
$0.03↓#28363↓0.3312.9 years↓
"When this creature enters, each player loses 1 life."
Howling Banshee78%
$0.05↓#24930↓0.2417.1 years
"When this creature enters, each player loses 3 life."
Rabid Bloodsucker78%
$0.08↓#27217↓0.2111.1 years↓
"When this creature enters, each player loses 2 life."
Thunder of Unity78%
$0.19↓#9702↓0.16↓1.4 years↓
"Whenever a creature you control enters this turn, each opponent loses 1 life and you gain 1 life."
Trespasser's Curse76%
$0.40↑#5150↓0.249.4 years↓
"Whenever a creature enchanted player controls enters, that player loses 1 life and you gain 1 life."
Grim Guardian76%
$0.36↑#3238↓0.2212.3 years↓
"Whenever this creature or another enchantment you control enters, each opponent loses 1 life."
Obyra, Dreaming Duelist75%
$0.34↑#3406↓0.243.0 years↓
"Whenever another Faerie you control enters, each opponent loses 1 life."
Pierce Strider74%
$0.06↓#23083↓0.15↓15.6 years↓
"When this creature enters, target opponent loses 3 life."
Flayer Drone73%
$0.21↑#18814↓0.00↓10.6 years↓
"Whenever another colorless creature you control enters, target opponent loses 1 life."
Soultether Golem73%
$0.33↑#26993↓0.00↓19.3 years↑
"Whenever another creature you control enters, put a time counter on this creature."
Jaws of Defeat72%
$0.76↑#4323↓0.45↑1.4 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%
$0.31↑#9032↓0.00↓8.9 years↓
"Whenever this creature attacks, each opponent loses 1 life."
Pulse Tracker72%
$0.14↓#9918↓0.2416.6 years
"Whenever this creature attacks, each opponent loses 1 life."
Infectious Horror72%
$0.10↓#19721↓0.11↓17.6 years
"Whenever this creature attacks, each opponent loses 2 life."