Acid-Spewer Dragon is a uncommon Creature — Dragon card from Dragons of Tarkir (DTK), collector number 86. Current market price: $0.26 (foil $0.93), TCGplayer market prices via Scryfall.
Flying, deathtouch Megamorph {5}{B}{B} (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, put a +1/+1 counter on each other Dragon creature you control.