Emrakul, the Promised End

This spell costs 1 less to cast for each card type
among cards in your graveyard.
When you cast this spell, 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
Howl ye; for the day of the LORD is at hand;
it shall come as a destruction from the Almighty.