Simic Devourer

Devour 2 (As this enters the battlefield, you
may sacrifice any number of creatures. This creature enters the battlefield with twice that
many +1/+1 counters on it.)
Graft 0 (This creature enters the battlefield with
0 +1/+1 counters on it. Whenever another creature enters the battlefield, you may move a +1/+1 counter from this creature onto it.)