Shape-Change Reveangent

Whenever a mutant enters the battlefield or dies,
put a +1/+1 counter on Shape-Change
Reveangent.
Remove a +1/+1 counter from Shape-Change Reveangent: Shape-Change Reveangent gains
your choice of either First Strike, Lifelink, Reach
or Trample until end of turn.
{t}, Remove three +1/+1 counters from
Shape-Change Reveangent: Mutate.