Warren Soultrader + Seedship Broodtender + Reveillark + Boss's Chauffeur + Prosperous Innkeeper

Warren Soultrader

Seedship Broodtender

Reveillark

Boss's Chauffeur

Prosperous Innkeeper

How it works

1. Activate Warren Soultrader by paying 1 life and sacrificing Reveillark.
2. When Reveillark dies, it triggers, returning Seedship Broodtender and Boss's Chauffeur from your graveyard to the battlefield. Boss's Chauffeur will enter with a +1/+1 counter on it equal to the number of creatures you control.
3. When Seedship Broodtender enters, it, Prosperous Innkeeper and Boss's Chauffeur trigger.
4. Resolve the Prosperous Innkeeper trigger, causing you to gain 1 life.
5. Resolve the Boss's Chauffeur trigger, putting a +1/+1 counter on Boss's Chauffeur.
6. Resolve the Seedship Broodtender trigger, causing you to mill three cards.
7. Resolve the Warren Soultrader ability, creating a Treasure token.
8. Activate Warren Soultrader by paying 1 life and sacrificing Boss's Chauffeur.
9. When Boss's Chauffeur dies, it triggers, creating a 1/1 Citizen creature token for each +1/+1 counter on it.
10. When the Citizens enter, Prosperous Innkeeper triggers that many times, causing you to gain that much life.
11. Resolve the Warren Soultrader ability, creating a Treasure token.
12. Activate Warren Soultrader by paying 1 life and sacrificing a Citizen, creating a Treasure token.
13. Repeat step 12 two additional times.
14. Activate five Treasures by tapping and sacrificing them, adding 3.
15. Activate Seedship Broodtender by paying 3 and sacrificing it, returning Reveillark from your graveyard to the battlefield.
16. When Reveillark enters, Prosperous Innkeeper triggers, causing you to gain 1 life.
17. Repeat.

This intricate loop is masterminded by Warren Soultrader, whose ability to sacrifice creatures for Treasure tokens provides both the necessary fodder and the mana generation. Reveillark serves as the primary engine by bringing back Seedship Broodtender and Boss's Chauffeur whenever it dies, while Prosperous Innkeeper cushions your life total and triggers life gains off every new arrival. Boss's Chauffeur grows large with counters and bursts into an army of Citizen tokens upon death, which can then be sacrificed to Warren Soultrader to supplement your mana. Finally, Seedship Broodtender recycles the fallen Reveillark back to the battlefield by spending the accumulated mana, allowing the entire cycle to repeat indefinitely for boundless resources and triggers.