Acid-Spewer Dragon

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 Acid-Spewer Dragon is turned face up,
put a +1/+1 counter on each other Dragon
creature you control.