The Wither

Flying, Wither
The Wither's power and toughness is equal
to the number of cards in exile you control.
When The Wither enters the battlefield it deals
damage equal to its power to each creature.
The Wither takes damage in the -1/-1 counters
While it's power is greater than 4 it must attack
each combat if able
while it's power is less than 4 it has defender