Cersei Lannister

{x},{t}: Search you library for a Child of Incest with converted mana cost {x} or less and put it into your hand. Then shuffle your library.
{t}: Transform Cersei Lannister. Activate this ability only if you have three Children of Incest in your graveyard and only as a sorcery.
When you play the game of thrones, you win or you die.