Activate Warren Soultrader by paying 1 life and sacrificing the persist creature.
When the persist creature dies, its persist ability and Moldervine Reclamation trigger.
Resolve the persist trigger, returning the persist creature from your graveyard to the battlefield with a -1/-1 counter on it.
Resolve the Moldervine Reclamation trigger, causing you to gain 1 life and draw a card.
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 clever loop turns the cycle of life and death into an unstoppable engine, fueled by Warren Soultrader sacrificing a creature to generate a Treasure token. Because that sacrifice triggers Moldervine Reclamation, you continuously recoup your life investment while drawing deep into your deck. Meanwhile, Mm'menon, Uthros Exile watches over the carnage, using the arrival of each new Treasure to place a +1/+1 counter that neatly neutralizes the -1/+1 counters bringing your recursive creature back.