Metascale Dragon

Flying
Morph {3}{r}{r} (You may play this creature face
down as a 2/2 creature for {3}. Turn it face up at any time for its morph cost.)
When Metascale Dragon is turned face up, put a +1/+1 counter on each creature you control, then choose a creature type.
Creatures you control with a +1/+1 counter on them are the chosen creature type in addition to their other types.