Rhaast, Keeper of Souls

Flying, Trample

Rhaast, Keeper of Souls' power is equal to the number of creatures exiled under it.

{x}{x}: Exile target creature with converted mana cost equal to X under Rhaast, Keeper of Souls. Rhaast, keeper of Souls gains all abilities of creatures exiled this way.

If this card would leave the battlefield, you may instead choose one creature exiled under Rhaast, Keeper of Souls and return it to it's owners exile.