Aven Mimeomancer is a rare Creature — Bird Wizard card from Alara Reborn (ARB), collector number 2. Current market price: $0.34 (foil $3.10), TCGplayer market prices via Scryfall.
Flying At the beginning of your upkeep, you may put a feather counter on target creature. If you do, that creature has base power and toughness 3/1 and has flying for as long as it has a feather counter on it.