Sion, the Undying

Trample, haste, annihilator 1
Whenever Sion, the Undying attacks, deal
damage equal to it's power to any target.
Whenever Sion deals combat damage, put a
+1/+1 counter on Sion.
At the end of your first combat phase each turn,
untap Sion. There is another combat phase after
this one.