Savathun The Witch Queen

Flying, Ward-Mill Ten Cards, Ghost 5

When Savathun Enters or attacks each opponent mills 3 cards then discards a card.

Eminence-- Whenever an instant or sorcery spell is put into an opponents 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.