Mortuary + Viscera Seer + Gwenom, Remorseless + Grave Venerations

Mortuary

Viscera Seer

Gwenom, Remorseless

Grave Venerations

How it works

1. Cast Viscera Seer by paying its mana cost.
2. Activate Viscera Seer by sacrificing it.
3. When Viscera Seer dies, Mortuary and Grave Venerations trigger.
4. Resolve the Mortuary trigger, putting Viscera Seer from your graveyard onto the top of your library.
5. Resolve the Grave Venerations trigger, causing each opponent to lose 1 life and you to gain 1 life.
6. Cast Viscera Seer from the top of your library by paying 1 life.
7. Repeat from step 2.