Sek'Kuar, Deathkeeper + Warren Soultrader + Nether Traitor + Carmen, Cruel Skymarcher

Sek'Kuar, Deathkeeper

Warren Soultrader

Nether Traitor

Carmen, Cruel Skymarcher

How it works

1. Activate Warren Soultrader by sacrificing Nether Traitor and paying 1 life.
2. When Nether Traitor dies, Carmen and Sek'Kuar trigger.
3. Resolve the Carmen trigger, causing you to gain 1 life and putting a +1/+1 counter on it.
4. Resolve the Sek'Kuar trigger, creating a 3/1 Graveborn creature token.
5. Resolve the Warren Soultrader ability, creating a Treasure token.
6. Activate the Treasure by tapping and sacrificing it, adding .
7. Activate Warren Soultrader by paying 1 life and sacrificing the Graveborn.
8. When the Graveborn dies, Carmen and Nether Traitor trigger.
9. Resolve the Carmen trigger, causing you to gain 1 life and putting a +1/+1 counter on it.
10. Resolve the Nether Traitor trigger, causing you to pay to return Nether Traitor from your graveyard to the battlefield.
11. Resolve the Warren Soultrader ability, creating a Treasure token.
12. Repeat.

This loop transforms Warren Soultrader into an efficient engine by using it as a persistent sacrifice outlet that constantly generates Treasure tokens and fuels its own costs. Nether Traitor serves as the recurring heart of the sequence, easily returning from the graveyard using the black mana produced by the Treasures while also triggering Sek'Kuar, Deathkeeper to supply a steady stream of Graveborn tokens. Meanwhile, Carmen, Cruel Skymarcher watches every sacrifice happen, accumulating a growing collection of +1/+1 counters and life to sustain the loop indefinitely.