Ezom, Desiring Silence

Ezom, Desiring Silence can't be the target of instants, sorceries, or enchantments.
Whenever another creature enters the battlefield, if it has one or more creature types that it does not share with another creature on the battlefield, put a -1/-1 counter on it for each creature type it has that it does not share with
another creature.
"Be silent, children. Nature is too crowded."