Balemurk Leech 

Creature — Leech
$0.17 #7991 0.24 2.1 years
Eerie — Whenever an enchantment you control enters and whenever you fully unlock a Room, each opponent loses 1 life.
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Cards similar to Balemurk Leech 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 Guardian93%
$0.33↑#3403↑0.1812.5 years↑
"Whenever this creature or another enchantment you control enters, each opponent loses 1 life."
Gremlin Tamer87%
$0.22↑#87870.00↓2.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, create a 1/1 red Gremlin creature token."
Erratic Apparition84%
$0.14↓#22483↓0.06↓2.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, this creature gets +1/+1 until end of turn."
Stalked Researcher83%
$0.10↓#25206↓0.00↓2.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, this creature can attack this turn as though it didn't have defender."
Scrabbling Skullcrab83%
$0.25↑#11552↓0.11↓2.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, target player mills two cards."
Optimistic Scavenger83%
$0.26↑#95490.00↓2.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, put a +1/+1 counter on target creature."
Entity Tracker80%
$0.34↑#2235↑0.152.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, draw a card."
Unwilling Vessel80%
$0.17#17234↓0.00↓2.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, put a possession counter on this creature."
Underworld Coinsmith80%
$0.26↑#9946↓0.07↓12.5 years↑
"Whenever this creature or another enchantment you control enters, you gain 1 life."
Ghostly Dancers79%
$0.37↑#3968↑0.07↓2.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, create a 3/1 white Spirit creature token with flying."
Cult Healer79%
$0.05↓#22218↓0.05↓2.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, this creature gains lifelink until end of turn."
Dashing Bloodsucker78%
$0.15↓#23064↓0.06↓2.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, this creature gets +2/+0 and gains lifelink until end of turn."
Skullsnap Nuisance77%
$0.18↑#15711↓0.00↓2.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, surveil 1."
Infernal Phantom76%
$0.15↓#22762↓0.00↓2.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, this creature gets +2/+0 until end of turn."
Wicked Visitor76%
$0.32↑#11466↓0.00↓3.1 years↑
"Whenever an enchantment you control is put into a graveyard from the battlefield, each opponent loses 1 life."
Northern Air Temple74%
$0.28↑#75110.260.9 years↓
"Whenever another Shrine you control enters, each opponent loses 1 life and you gain 1 life."
Fear of Infinity74%
$0.20↑#12741↓0.00↓2.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, you may return this card from your graveyard to your hand."
Nexus Wardens73%
$0.21↑#17171↓0.11↓6.7 years↑
"Whenever an enchantment you control enters, you gain 2 life."
Thoughtrender Lamia71%
$0.33↑#11481↓0.50↑12.5 years↑
"Whenever this creature or another enchantment you control enters, each opponent discards a card."