Emrakul, the Promised End [Eldritch Moon Prerelease Promos]

Description

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 instantsAn enigma as vexing as life itself.