Tz'arkan, Drinker of Worlds

Fear, Lifelink, First-strike
Nonblack creatures opponent controls get -2/-2.
Other black elf creatures have fear.
At the beginning of your end step, sacrifice
Tz'arkan unless you pay 4life and tranform him.
"I am like unto a god, Malus. You could be, too.
If you are worthy."
-Tz'arkan, Drinker of Worlds