Eccentric Apprentice 

Creature — Tiefling Wizard
$0.21 #11745 0.31 5.1 years
Flying
When this creature enters, venture into the dungeon. (Enter the first room or advance to the next room.)
At the beginning of combat on your turn, if you've completed a dungeon, up to one target creature becomes a Bird with base power and toughness 1/1 and flying until end of turn.
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Cards similar to Eccentric Apprentice 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.
Cloister Gargoyle86%
$0.20↓#140500.20↓5.1 years
"When this creature enters, venture into the dungeon."
+1 more matching line
Ghost-Lit Drifter74%
$0.15↓#26527↓0.365.2 years
"
: Another target creature gains flying until end of turn."
Barrowin of Clan Undurr74%
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"When Barrowin enters, venture into the dungeon."
Nadaar, Selfless Paladin74%
$0.39↑#6417↑0.05↓5.1 years
"Whenever this card enters or attacks, venture into the dungeon."