Risoka, the Hands of Fate

Hexproof, Flying, Rebound (When this card is destroyed, put it on top of your library instead of your graveyard)
{u}{b}, Draw 1 card, put a card on top of your library, destroy target creature and lose 1 life
At the beginning of your upkeep, reveal the top card of your library, if it was put there from your hand last turn, you may cast the card without paying its mana cost.