Darth Zannah, Sith Sorceress

Hexproof

Impenetrable Defense: Whenever Darth Zannah, Sorceress of the Sith, blocks, you may pay {1}{b}. If you do, prevent all combat damage that would be dealt to her this turn.

Sith Sorcery: {3}{b}, {t}: Target opponent reveals their hand. You choose a nonland card from it. That player discards that card, then loses life equal to its mana value and you gain life equal to its mana value.