Kthyr, Guardian of Zalim

On your upkeep put a 2/2 skeleton onto the battlefield.
At the beginning of each upkeep put a +1/+1
counter on each skeleton you control.
{t}, Sacrifice X skeletons: Deal X damage to target
player or put X +1/+1 counters on Kthyr.
"What the hell! A big thing WITH little things!"
-OVERLORD