Emrakul, the Promised End

Emrakul, the Promised End costs {1} less to cast
for each card type among cards in your
graveyard.
When you cast Emrakul, you gain control of
target opponent during that player's next turn.
After that turn, that player takes an extra turn.
Flying, Trample, Protection from Instants
An enigma as vexing as life itself.