Activate Warren Soultrader by paying 1 life and sacrificing the persist creature.
When the persist creature dies, its persist ability triggers, returning the persist creature from your graveyard to the battlefield with a -1/-1 counter on it.
When the persist creature enters, Kor Celebrant triggers, causing you to gain 1 life.
Resolve the Warren Soultrader ability, creating a Treasure token.
When the Treasure enters, Mm'menon triggers, putting a +1/+1 counter on the persist creature.
Repeat.
This loop is an exquisite exercise in balancing life and death, turning a single persistent creature into an infinite engine of mana and materials. You begin by feeding a creature to Warren Soultrader, paying a life to harvest a Treasure token and triggering the creature's return via persist with a -1/-1 counter. The moment that creature stumbles back onto the battlefield, Kor Celebrant steps in to restore the life you just paid, while the resulting Treasure arrival prompts Mm'menon, Uthros Exile to drop a +1/+1 counter onto the returning creature. Because state-based actions immediately neutralize that -1/-1 counter with the new +1/+1 counter, the creature is instantly primed to be sacrificed to Warren Soultrader all over again, netting you endless resources without ever running out of life or fodder.