Sek'Kuar, Deathkeeper + Warren Soultrader + Nether Traitor + Verdant Sun's Avatar

Sek'Kuar, Deathkeeper

Warren Soultrader

Nether Traitor

Verdant Sun's Avatar

How it works

1. Activate Warren Soultrader by sacrificing Nether Traitor and paying 1 life.
2. When Nether Traitor dies, Sek'Kuar triggers, creating a 3/1 Graveborn creature token.
3. When the Graveborn enters the battlefield, Verdant Sun's Avatar triggers, causing you to gain 1 life.
4. Resolve the Warren Soultrader ability, creating a Treasure token.
5. Activate the Treasure by tapping and sacrificing it, adding .
6. Activate Warren Soultrader by paying 1 life and sacrificing the Graveborn.
7. When the Graveborn dies, Nether Traitor triggers, causing you to pay to return Nether Traitor from your graveyard to the battlefield.
8. When Nether Traitor enters the battlefield, Verdant Sun's Avatar triggers, causing you to gain 1 life.
9. Resolve the Warren Soultrader ability, creating a Treasure token.
10. Repeat.

This recursive loop uses Warren Soultrader as the engine to repeatedly sacrifice and recycle Nether Traitor, turning the black mana generated by the resulting Treasure tokens into infinite life and sacrificial triggers. While Nether Traitor supplies the recurring fodder, Sek'Kuar, Deathkeeper translates each of those deaths into a hasty Graveborn token that keeps the loop churning. Finally, Verdant Sun's Avatar capitalizes on the revolving door of creatures entering the battlefield, padding your life total indefinitely with every single cycle.