Skullsnap Nuisance 
Creature — Insect Skeleton
$0.21 #14990 0.19 1.9 years
Flying
Eerie — Whenever an enchantment you control enters and whenever you fully unlock a Room, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)
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Cards similar to Skullsnap Nuisance 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.
Optimistic Scavenger86%
$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."
Victor, Valgavoth's Seneschal84%
$0.31↑#5271↑0.30↑1.9 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, surveil 2 if this is the first time this ability has resolved this turn. If it's the second time, each opponent discards a card. If it's the third time, put a creature card from a graveyard onto the battlefield under your control."
Erratic Apparition84%
$0.12↓#21733↓0.07↓1.9 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, this creature gets +1/+1 until end of turn."
Gremlin Tamer82%
$0.29↑#8117↑0.151.9 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, create a 1/1 red Gremlin creature token."
Unwilling Vessel81%
$0.17↓#164560.04↓1.9 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, put a possession counter on this creature."
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."
Stalked Researcher80%
$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."
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↓0.05↓1.9 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, this creature gains lifelink until end of turn."
Scrabbling Skullcrab78%
$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."
Balemurk Leech78%
$0.17↓#7620↑0.121.9 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, each opponent loses 1 life."
Wary Farmer78%
$0.14↓#19494↓0.00↓0.6 years↓
"At the beginning of your end step, if another creature entered the battlefield under your control this turn, surveil 1."
Dashing Bloodsucker78%
$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."
Shore Lurker76%
$0.09↓#24720↓0.00↓0.6 years↓
"When this creature enters, surveil 1."
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."
Path of Discovery76%
$0.23↑#3633↑0.248.6 years↑
"Whenever a creature you control enters, it explores."
Sanitation Automaton76%
$0.08↓#22325↓0.182.6 years
"When this creature enters, surveil 1."
Whisper Agent76%
$0.07↓#23860↓0.43↑7.9 years↑
"When this creature enters, surveil 1."
Wreckage Wickerfolk76%
$0.21#141600.151.6 years
"When this creature enters, surveil 2."
Watcher in the Mist76%
$0.05↓#28012↓0.00↓7.9 years↑
"When this creature enters, surveil 2."