Emrakul, Multiverse Destroyer

This spell can't be countered
Flying, Protection from colored spells, Annihilator 6
When Emrakul, Multiverse Destroyer enters the
battlefield or attacks, take an extra turn after this
one. Your opponent can't take extra turns.
When Emrakul, Multiverse Destroyer is put into
the graveyard from anywhere, its owner shuffles
it back into their library.