Mr. Castaigne, Heir of Hastur

Extort ( Whenever you cast a spell, you may pay {w/b}. If you do, each opponent loses 1 life and you gain that much life.)

Whenever you tap a Swamp for mana, add an additional {b}.

"A diadem fit for a King among kings, an Emperor among emperors. The King in Yellow might scorn it, but it shall be worn by his royal servant."