Bulette Ravager

Bulette Ravager enters the battlefield with three
+1/+1 counters on it.
{g}: {t}, Put a +1/+1 counter on Bulette Ravager.
Then you may have Bulette Ravager fight target
creature you don't control.
{5}{g}: Monstrosity 4 (If this permanent isn't
monstrous, put 4 +1/+1 counters on it and it
becomes monstrous.)