Gluttonous Onigon

Flying, trample
As an additional cost to cast Gluttonous Onigon, sacrifice a creature. You may sacrifice two
creatures instead. If you do it enters the
battlefield with haste.
—Whenever Gluttonous Onigon attacks, each
player sacrifices another creature. At the
beginning that endstep put a +1/+1 counter
on it for each creature that died that turn.