Balemurk Leech 

Creature — Leech
$0.17 #7620 0.12 1.9 years
Eerie — Whenever an enchantment you control enters and whenever you fully unlock a Room, each opponent loses 1 life.
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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%
$0.36↑#3238↑0.22↑12.3 years↑
"Whenever this creature or another enchantment you control enters, each opponent loses 1 life."
Gremlin Tamer87%
$0.29↑#81170.151.9 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, create a 1/1 red Gremlin creature token."
Optimistic Scavenger84%
$0.27↑#9242↓0.171.9 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, put a +1/+1 counter on target creature."
Erratic Apparition84%
$0.12↓#21733↓0.071.9 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%
$0.09↓#24437↓0.131.9 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%
$0.27↑#11246↓0.111.9 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, target player mills two cards."
Entity Tracker80%
$0.48↑#2133↑0.101.9 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, draw a card."
Unwilling Vessel80%
$0.17#16456↓0.041.9 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, put a possession counter on this creature."
Underworld Coinsmith80%
$0.29↑#9478↓0.0812.3 years↑
"Whenever this creature or another enchantment you control enters, you gain 1 life."
Ghostly Dancers79%
$0.37↑#3685↑0.101.9 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 Healer78%
$0.06↓#21514↓0.051.9 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, this creature gains lifelink until end of turn."
Skullsnap Nuisance78%
$0.21↑#14990↓0.191.9 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, surveil 1."
Dashing Bloodsucker77%
$0.12↓#22278↓0.161.9 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."
Wicked Visitor76%
$0.26↑#11071↓0.00↓3.0 years↑
"Whenever an enchantment you control is put into a graveyard from the battlefield, each opponent loses 1 life."
Infernal Phantom76%
$0.15↓#21995↓0.191.9 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, this creature gets +2/+0 until end of turn."
Northern Air Temple74%
$0.28↑#77300.00↓0.8 years↓
"Whenever another Shrine you control enters, each opponent loses 1 life and you gain 1 life."
Fear of Infinity74%
$0.26↑#12117↓0.121.9 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%
$0.19↑#16902↓0.47↑6.6 years↑
"Whenever an enchantment you control enters, you gain 2 life."
Thoughtrender Lamia71%
$0.35↑#10915↓0.65↑12.3 years↑
"Whenever this creature or another enchantment you control enters, each opponent discards a card."