Bane of Existence

At the end of your turn, return Bane of Existence to your hand. When you do, discard a nonland permanent from your hand.
Exile any spells an opponent played before Bane of Existence was cast.
"Every once in a while, there are anomalies in the Multiverse. Unfortunately, we can't study them without being destroyed."
-Jager Iwashima, Scout Battalion 12