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, Social Climber 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 turns a creature with persist into a perpetual engine by leveraging Warren Soultrader to sacrifice it for a Treasure token, offsetting the life payment with Social Climber's lifegain trigger whenever a creature enters. The newly created Treasure token triggers Mm'menon, Uthros Exile upon entry, placing a +1/+1 counter on the persist creature to instantly neutralize the -1/+1 counter it received from returning to the battlefield. Because both counters annihilate each other, the creature is left completely clean and ready to be sacrificed over and over again, generating infinite colored mana, death triggers, and Treasures.