Skullsnap Nuisance 
Creature — Insect Skeleton
$0.18 #15711 0.00 2.1 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 Scavenger84%
$0.26↑#9549↑0.002.1 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%
$0.28↑#5684↑0.17↑2.1 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 Apparition83%
$0.14↓#22483↓0.062.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, this creature gets +1/+1 until end of turn."
Gremlin Tamer80%
$0.22↑#8787↑0.002.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, create a 1/1 red Gremlin creature token."
Wary Farmer80%
$0.10↓#19470↓0.020.7 years↓
"At the beginning of your end step, if another creature entered the battlefield under your control this turn, surveil 1."
Unwilling Vessel80%
$0.17↓#172340.002.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, put a possession counter on this creature."
Entity Tracker80%
$0.34↑#2235↑0.15↑2.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, draw a card."
Stalked Researcher79%
$0.10↓#25206↓0.002.1 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."
Ghostly Dancers78%
$0.37↑#3968↑0.072.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, create a 3/1 white Spirit creature token with flying."
+1 more matching line
Cult Healer78%
$0.05↓#22218↓0.052.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, this creature gains lifelink until end of turn."
Scrabbling Skullcrab78%
$0.25↑#11552↑0.11↑2.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, target player mills two cards."
Fatehold Chronologist // Peer Review78%
$0.11↓#21980↓0.010.0 years↓
"Flying"
Balemurk Leech77%
$0.17↓#7991↑0.24↑2.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, each opponent loses 1 life."
Dashing Bloodsucker77%
$0.15↓#23064↓0.062.1 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."
MACH-1, Swooping Scoundrel76%
$0.26↑#25846↓0.27↑0.3 years↓
"When this card enters and whenever you gain life, surveil 1. This ability triggers only once each turn."
Snarling Gorehound76%
$0.25↑#5223↑0.29↑2.7 years
"Whenever another creature you control with power 2 or less enters, surveil 1."
Vanguard Seraph76%
$0.17↓#10496↑0.10↑1.9 years
"Whenever you gain life for the first time each turn, surveil 1."
Infernal Phantom76%
$0.15↓#22762↓0.002.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, this creature gets +2/+0 until end of turn."
Sinister Starfish76%
$0.10↓#9225↑0.005.3 years↑
"
: Surveil 1."
: Surveil 1."
Nightveil Sprite74%
$0.14↓#6901↑0.008.0 years↑
"Whenever this creature attacks, surveil 1."