Aven Mimeomancer is a rare Creature — Bird Wizard card from New Capenna Commander (NCC), collector number 329. Current market price: $0.37, 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.