Selene's Last Assault

As an additional cost to cast Selene's Last Assault, Exile a creature you control.
All creatures lose indestructible and hexproof until end of turn. Selene's Last Assault deals X damage to each creature, where X is twice the power of the exiled creature. If a Titan or Zombie would die this way, exile it instead.
"Sister...Your sacrifice will never be forgotten..."
-Zuragi, the Northern Winds