Erratic Apparition {2}{U}
Creature — Spirit
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 that do something similar expected a card that isn't here?
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Infernal Phantom 91%
$0.12#21733
"Whenever an enchantment you control enters and whenever you fully unlock a Room, this creature gets +2/+0 until end of turn."
Setessan Skirmisher 91%
$0.06#27676
"Whenever an enchantment you control enters, this creature gets +1/+1 until end of turn."