Balemurk Leech {1}{B}
Creature — Leech
Eerie — Whenever an enchantment you control enters and whenever you fully unlock a Room, each opponent loses 1 life.
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Cards that do something similar 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.
Grim Guardian 88%
$0.37#3169
"Whenever this creature or another enchantment you control enters, each opponent loses 1 life."
Hopeless Nightmare 88%
$0.34#5967
"When this enchantment enters, each opponent discards a card and loses 2 life."
Obyra, Dreaming Duelist 85%
$0.35#3394
"Whenever another Faerie you control enters, each opponent loses 1 life."
Suture Priest 84%
$5.33#1190
"Whenever a creature an opponent controls enters, you may have that player lose 1 life."
Blood Seeker 84%
$0.38#2617
"Whenever a creature an opponent controls enters, you may have that player lose 1 life."
Tinybones Joins Up 83%
$0.47#4122
"Whenever a legendary creature you control enters, any number of target players each mill a card and lose 1 life."
Kroxa, Titan of Death's Hunger 83%
$3.20#4801
"Whenever this card enters or attacks, each opponent discards a card, then each opponent who didn't discard a nonland card this way loses 3 life."
Obsessive Pursuit 82%
$0.28#6411
"When this enchantment enters and at the beginning of your upkeep, you lose 1 life and create a Clue token."
Forerunner of the Coalition 81%
$0.59#7253
"Whenever another Pirate you control enters, each opponent loses 1 life."
Dusk Mangler 80%
$0.25#10070
"When this creature enters, each opponent sacrifices a creature of their choice, discards a card, and loses 4 life."
Corpse Knight 80%
$0.83#1388
"Whenever another creature you control enters, each opponent loses 1 life."
Malboro 80%
$0.19#9387
"When this creature enters, each opponent discards a card, loses 2 life, and exiles the top three cards of their library."