Eccentric Apprentice is a uncommon Creature — Tiefling Wizard card from Adventures in the Forgotten Realms (AFR), collector number 57. Current market price: $0.28 (foil $0.27), TCGplayer market prices via Scryfall.
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.