Grixxum the Devourer

Devour 4 (As this enters the battlefield, you may sacrifice any number of creatures. This creature enters
the battlefield with four times that many
+1/+1 counters on it.)
Other Demon creatures you control get +X/+X
where X is the number of +1/+1 counters on
Grixxum the Devourer
He is as insatiable as he is corrupted.