Sek'Kuar, Deathkeeper + Warren Soultrader + Nether Traitor + Leyline of Vitality

Sek'Kuar, Deathkeeper

Warren Soultrader

Nether Traitor

Leyline of Vitality

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, Leyline of Vitality 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, Leyline of Vitality triggers, causing you to gain 1 life.
9. Resolve the Warren Soultrader ability, creating a Treasure token.
10. Repeat.

This clever loop turns the self-recurring persistence of Nether Traitor into an endless sacrifice engine powered by Warren Soultrader. As Nether Traitor and the 3/1 Graveborn tokens created by Sek'Kuar, Deathkeeper bounce back and forth between the battlefield and the grave, you are able to continuously sacrifice them to generate an endless supply of Treasure tokens and colored mana. Meanwhile, the life you spend to activate Warren Soultrader is completely offset by the steady stream of lifegain provided by Leyline of Vitality every time a new creature enters the battlefield.