Savathun The Witch Queen

Flying, Ward-Mill Ten Cards

When Savathun Enters or attacks each player mills 5 cards.

Eminence-- Whenever an instant or sorcery spell is put into a graveyard from anywhere, exile it. For the rest of the game you may cast spells exiled this way as though they had flash. Spells cast this way do not return to graveyard and are exiled permanently instead.

If Savathun would die exile it instead, then return it to the battlefield tapped at the beginning of your next upkeep.