Cruel Bargain in your graveyard or in your library.
Mikaeus in your graveyard or in your library.
Sacrifice in your graveyard or in your library.
Viscera Seer in your graveyard or in your library.
Walking Ballista in your graveyard or in your library.
K'rrik on the battlefield.
Doomsday and Aphotic Wisps in hand.
Your life total is at least 34.
Steps
Cast Doomsday by paying 6 life, searching your library and graveyard for Cruel Bargain, Sacrifice, Mikaeus, Walking Ballista, and Viscera Seer, 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.
Cast Aphotic Wisps by paying 2 life, targeting K'rrik, causing you to draw a card.
Cast Cruel Bargain by paying 6 life, causing you to draw four life and losing half your life, rounded up.