Doomsday by paying ({B} magic symbol) ({B} magic symbol) ({B} magic symbol) , searching your library and graveyard for
Bolas's Citadel,
Emergence Zone,
Repay in Kind,
Lich, and any other card, exiling all other cards from your graveyard and library, and then placing the remaining cards on top of your library in the order previously listed and losing half your life, rounded up.
Activate
Commander's Sphere by sacrificing it, drawing a card.