Aven Sunstriker is a uncommon Creature — Bird Warrior card from Dragons of Tarkir (DTK), collector number 5. Current market price: $0.20 (foil $0.89), TCGplayer market prices via Scryfall.
Flying Double strike (This creature deals both first-strike and regular combat damage.) Megamorph {4}{W} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its megamorph cost and put a +1/+1 counter on it.)