Steeped Guerrillas

Process X (Whenever this attacks, you may put up to two cards in exile in their owners' graveyard.)
When Steeped Guerrillas attacks, its process value is equal to the number of counters on it.
Megamorph {w}{u}{b}{g}(You may cast this face down as a 2/2 creature for {3}. Turn it face up at any time for its megamorph cost. Put a +1/+1 counter on it.)