Den Protector is a rare Creature — Human Warrior card from Dragons of Tarkir Promos (PDTK), collector number 181s. Current market price: — (foil $1.32), TCGplayer market prices via Scryfall.
Creatures with power less than this creature's power can't block it. Megamorph {1}{G} (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.) When this creature is turned face up, return target card from your graveyard to your hand.