Merciless Watchers

Megamorph {4}{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.)
When Merciless Watchers is turned face up, create a 3/1 green mutant creature token
named Merciless Cheiftain and put a +1/+1 counter on it.