Emrakul, Twisted Goddess

You may sacrifice ten Eldrazi instead of paying Emrakul, Twisted Goddess's mana cost.
When you cast Emrakul, untap all creatures and
gain control of them until end of turn. They gain
haste until end of turn.
Flying, Hexproof from colored spells
Whenever Emrakul attacks, defending player
exiles four permanents that he or she controls.