Mortuary + Viscera Seer + Susurian Voidborn + Gwenom, Remorseless

Mortuary

Viscera Seer

Susurian Voidborn

Gwenom, Remorseless

How it works

1. Activate Viscera Seer by sacrificing it.
2. When Viscera Seer dies, Mortuary and Susurian Voidborn trigger.
3. Resolve the Mortuary trigger, putting Viscera Seer from your graveyard onto the top of your library.
4. Resolve the Susurian Voidborn trigger, causing you to gain 1 life and target opponent to lose 1 life.
5. Resolve the Viscera Seer ability.
6. Cast Viscera Seer from the top of your library by paying 1 life.
7. Repeat.

This loop hinges on the clever intersection of Mortuary and Gwenom, Remorseless, which together allow you to continuously cast a creature straight from the top of your library by paying life instead of its mana cost. By repeatedly sacrificing Viscera Seer to its own ability, you trigger Mortuary to place it right back on top of your library while Susurian Voidborn steadily drains your opponent's life total down to zero. Gwenom, Remorseless makes this entire process self-sustaining through its alternative casting cost, turning what looks like a simple sacrifice into an infinite life-swinging engine.