Gudul Lurker is a uncommon Creature — Salamander card from Dragons of Tarkir (DTK), collector number 56. Current market price: $0.45 (foil $5.22), TCGplayer market prices via Scryfall.
This creature can't be blocked. Megamorph {U} (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.)