Salt Road Ambushers is a uncommon Creature — Dog Warrior card from Dragons of Tarkir (DTK), collector number 198. Current market price: $0.10 (foil $0.55), TCGplayer market prices via Scryfall.
Whenever another permanent you control is turned face up, if it's a creature, put two +1/+1 counters on it. Megamorph {3}{G}{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.)