Warren Soultrader | Mm'menon, Uthros Exile | Funeral Room // Awakening Hall

(and one other card)

Persist Creature

All permanents on the battlefield (
Funeral Room // Awakening Hall with
Funeral Room unlocked and Persist Creature without a -1/-1 counter on it).

Activate
Warren Soultrader by paying 1 life and sacrificing the Persist Creature.
When the Persist Creature dies, its persist ability and
Funeral Room trigger.
Resolve the persist trigger, returning the Persist Creature from your graveyard to the battlefield with a -1/-1 counter on it.
Resolve the
Funeral Room trigger, causing each opponent to lose 1 life and 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.