Sam, Light in the Dark

Hexproof
At the beginning of each end step, you may
choose target instant or sorcery that entered your
graveyard this turn. If you do, you may cast that
card without paying its mana cost, then exile it.
"A wizard is never late, Froyo Boggins. Nor is
he early. He arrives precisely when he means to."
-Sam, Light in the Dark