Melisandre, the Red Woman

Hexproof
At the beginning of your upkeep, scry 2, then
exile the top card of your library face down.
Until end of turn, you may play that card.
Sacrifice another legendary creature: Choose a
card you own from outside the game and put it
into your hand. If a creature sacrificed this way
would be put into a graveyard, put it into exile
instead. Activate this ability only as a sorcery and
only once each turn.