Fear of Infinity 
Enchantment Creature — Nightmare
$0.26 #12117 0.12 1.9 years
Flying, lifelink
This creature can't block.
Eerie — Whenever an enchantment you control enters and whenever you fully unlock a Room, you may return this card from your graveyard to your hand.
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Cards similar to Fear of Infinity 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.
Redtooth Vanguard94%
$0.08↓#24649↓0.00↓3.0 years↑
"Whenever an enchantment you control enters, you may pay 
. If you do, return this card from your graveyard to your hand."
. If you do, return this card from your graveyard to your hand."
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."
Lightning Phoenix84%
$0.32↑#15368↓0.47↑6.1 years↑
"This creature can't block."
Ghostly Dancers82%
$0.37↑#3685↑0.101.9 years
"When this creature enters, return an enchantment card from your graveyard to your hand or unlock a locked door of a Room you control."
Phoenix Chick82%
$0.36↑#6082↑0.00↓4.0 years↑
"This creature can't block."
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."
Cult Healer80%
$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."
Squee, Goblin Nabob80%
$0.30↑#3925↑0.34↑26.9 years↑
"At the beginning of your upkeep, you may return this card from your graveyard to your hand."
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."
Forsaken Miner80%
$1.96↑#2453↑0.182.4 years
"This creature can't block."
Dashing Bloodsucker79%
$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."
Healer's Flock78%
$0.22↓#17430↓0.53↑5.2 years↑
"Flying, lifelink"
Seraph of Dawn78%
$0.14↓#144540.00↓14.3 years↑
"Flying, lifelink"
Insatiable Harpy78%
$0.04↓#27166↓0.47↑12.9 years↑
"Flying, lifelink"
Optimistic Scavenger78%
$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."
Ovalchase Daredevil78%
$0.21↓#15016↓0.00↓9.9 years↑
"Whenever an artifact you control enters, you may return this card from your graveyard to your hand."
Gremlin Tamer77%
$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."
Scrabbling Skullcrab77%
$0.27↑#112460.111.9 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, target player mills two cards."
Goblin Glider77%
$0.05↓#25272↓0.00↓28.2 years↑
"This creature can't block."
Aesthir Glider77%
$0.15↓#23292↓0.1830.2 years↑
"This creature can't block."