Erratic Apparition 
Creature — Spirit
$0.14 #22483 0.06 2.1 years
Flying, vigilance
Eerie — Whenever an enchantment you control enters and whenever you fully unlock a Room, this creature gets +1/+1 until end of turn.
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Cards similar to Erratic Apparition 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.
Infernal Phantom95%
$0.15↑#227620.002.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, this creature gets +2/+0 until end of turn."
Setessan Skirmisher92%
$0.07↓#28473↓0.006.7 years↑
"Whenever an enchantment you control enters, this creature gets +1/+1 until end of turn."
Dashing Bloodsucker92%
$0.15↑#230640.062.1 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."
Cult Healer90%
$0.05↓#222180.052.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, this creature gains lifelink until end of turn."
Optimistic Scavenger90%
$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."
Stalked Researcher90%
$0.10↓#252060.002.1 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."
Gremlin Tamer89%
$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."
Unwilling Vessel88%
$0.17↑#17234↑0.002.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, put a possession counter on this creature."
+1 more matching line
Entity Tracker88%
$0.34↑#2235↑0.152.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, draw a card."
Oakheart Dryads86%
$0.09↓#243620.0012.5 years↑
"Whenever this creature or another enchantment you control enters, target creature gets +1/+1 until end of turn."
Scrabbling Skullcrab86%
$0.25↑#11552↑0.112.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, target player mills two cards."
Ghostly Dancers86%
$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."
Pious Wayfarer84%
$0.16↑#241530.20↑6.7 years↑
"Whenever an enchantment you control enters, target creature gets +1/+1 until end of turn."
Fear of Infinity84%
$0.20↑#12741↑0.002.1 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."
Balemurk Leech84%
$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."
Nexus Wardens83%
$0.21↑#17171↑0.116.7 years↑
"Whenever an enchantment you control enters, you gain 2 life."
Skullsnap Nuisance83%
$0.18↑#15711↑0.002.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, surveil 1."
Oath of the Ancient Wood80%
$0.23↑#201120.0013.3 years↑
"Whenever this enchantment or another enchantment you control enters, you may put a +1/+1 counter on target creature."
Triton Waverider79%
$0.07↓#29121↓0.066.7 years↑
"Whenever an enchantment you control enters, this creature gains flying until end of turn."
Rampaging Soulrager79%
$0.09↓#252950.052.1 years
"This creature gets +3/+0 as long as there are two or more unlocked doors among Rooms you control."