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, Ayara triggers, causing you to gain 1 life and each opponent to lose 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 looping execution turns a humble creature with persist into an engine for infinite value, fueled by Warren Soultrader's ability to turn sacrifices into Treasure tokens. As those Treasures enter the battlefield, Mm'menon, Uthros Exile steps in to neutralize the persist creature's -1/-1 counters by placing a +1/+1 counter on it each time. Meanwhile, the constant recycling is observed by Ayara, First of Locthwain, who drains your opponents' life totals and pads your own with every single loop.