The Fool

Search your library and/or graveyard for a card
named Calith, the Jester King and put it into
your hand. If you have three Tarot cards in your graveyard, create a 2/1 black Assassin creature
token with deathtouch. Then if you searched
your library in this way, shuffle it.
Calith's appearances are swift, sudden, and usually involve putting a knife in someone's sternum.