Gluttonous Abnormality

Gluttonous Abnormality enters the battlefield with a +1/+1 counter on it for each opponent you have.
Whenever a creature deals combat damage to Gluttonous Abnormality, if it has a +1/+1 counter on it, remove a +1/+1 counter from it instead.
When Gluttonous Abnormality deals combat damage to a player, put a +1/+1 counter on it.