Uglur, the Elf Slayer

Whenever a creature an opponent controls dies, put a +1/+1 counter on
Uglur. If it was an Elf, you gain 2 life.
"Little elf prince had been fool to think all the woods were the same. Little elfling wanted to be so sneeeaky. Little elfling thougth he was sooo smaaart. Well, little elfling, now you're gonna be my lunch. Not so clever now, eh? "