Doomsday + Commander's Sphere + Bolas's Citadel + Emergence Zone + Repay in Kind + Lich

Doomsday

Commander's Sphere

Bolas's Citadel

Emergence Zone

Repay in Kind

Lich

How it works

1. Cast Doomsday by paying , 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.
2. Activate Commander's Sphere by sacrificing it, drawing a card.
3. Cast Bolas's Citadel by paying 3.
4. Play Emergence Zone from the top of your library.
5. Activate Emergence Zone by paying 1, tapping, and sacrificing it.
6. Cast Repay in Kind from the top of your library by paying seven life.
7. Holding priority, cast Lich from the top of your library by paying 4 life.
8. Lich entering the battlefield, causing you to lose life equal to your life total.
9. Resolve the Repay in Kind, causing each player's life total to become equal to the lowest life total among all players.