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, Angelic Chorus triggers, causing you to gain life equal to the creature's toughness.
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 delightfully self-sustaining loop relies on a persist creature's ability to constantly return from the graveyard, canceled out by the clever growth provided by Mm'menon, Uthros Exile whenever an artifact arrives. By utilizing Warren Soultrader, you feed your persistent creature to create a Treasure token while simultaneously gaining the life needed to sustain the cost thanks to Angelic Chorus. Because the entering Treasure triggers Mm'menon, Uthros Exile to place a +1/+1 counter on your recurring creature, it neatly erases the -1/+1 counter conflict, allowing you to repeat this gruesome sacrifice over and over for limitless resources.