Mitra, Lunar Priestess

Hexproof
Whenever you cast a noncreature spell, you may choose a target opponent. That opponent puts the top 3 cards of their library into their graveyard.
"Sealing the Masuka is a priority for those of us on the Lunar Isles. It helps ease spirits who pass into this realm. However, as of late, it has become much harder to do so."