Emrakul, The Promised End

Emrakul, the Promised End cost {1} less to cast
for each card type among cards in your graveyard.
When you cast Emrakul, the Promised End, 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.