Sek'Kuar, Deathkeeper | Warren Soultrader | Nether Traitor

(and one other card)

Activate
Warren Soultrader by sacrificing
Nether Traitor and paying 1 life.
When
Nether Traitor dies,
Carmen and
Sek'Kuar trigger.
Resolve the
Carmen trigger, causing you to gain 1 life and putting a +1/+1 counter on it.
Resolve the
Sek'Kuar trigger, creating a 3/1 Graveborn creature token.
Resolve the
Warren Soultrader ability, creating a Treasure token.
Activate the Treasure by tapping and sacrificing it, adding ({B} magic symbol) .
Activate
Warren Soultrader by paying 1 life and sacrificing the Graveborn.
When the Graveborn dies,
Carmen and
Nether Traitor trigger.
Resolve the
Carmen trigger, causing you to gain 1 life and putting a +1/+1 counter on it.
Resolve the
Nether Traitor trigger, causing you to pay ({B} magic symbol) to return
Nether Traitor from your graveyard to the battlefield.
Resolve the
Warren Soultrader ability, creating a Treasure token.
Repeat.