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, Aunt May 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 sets up an incredible cycle of sacrifice and rebirth by using Warren Soultrader to cash in creatures for Treasure tokens at the cost of a single life. As your sacrifices hit the graveyard, Aunt May steps in to cushion the blow by keeping your life total stable whenever another creature enters the battlefield. Meanwhile, the resulting artifacts trigger Mm'menon, Uthros Exile to steadily pump up your creatures, neutralizing any mechanical drawbacks like -1/-1 counters and letting you cycle the same persistent creature endlessly for infinite resources.