Savathun The Witch Queen

Flying, Ward-Mill Ten Cards

When Savathun Enters each player mills 5 cards.

Whenever an instant or sorcery spell is put into a graveyard from anywhere exile it. You may cast instant and sorcery spells exiled this way as though they had flash. Exile that spell after it resolves.

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