Cho'Gath, Insatiable Hunger

Devour 2 (You may sacrifice any number of creatures. Cho'Gath enters the battlefield with
2 +1/+1 counters for each creature sacrificed this
way.)
Whenever Cho'Gath enters the battlefield or attacks, each opponent may sacrifice a creature.
For each opponent who does not, Cho'Gath
fights up to one target creature that player controls.