Priscilla, the Deathsworn

Whenever you cast a noncreature spell, look at
the top card of your library, you may put it into
your hand, if you do, lose life equal to that card's converted mana cost.
Whenever you cast a creature spell, gain life
equal to that card's converted mana cost, then
return a card from your graveyard to your hand
Sacrifice a creature: Priscilla deals 1 damage to
any target.