Warren Soultrader + Seedship Broodtender + Reveillark + Boss's Chauffeur + Cruel Celebrant

Warren Soultrader

Seedship Broodtender

Reveillark

Boss's Chauffeur

Cruel Celebrant

How it works

1. Activate Warren Soultrader by paying 1 life and sacrificing Reveillark.
2. When Reveillark dies, it and Cruel Celebrant trigger.
3. Resolve the Cruel Celebrant trigger, causing you to gain 1 life and each opponent to lose 1 life.
4. Resolve the Reveillark trigger, 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.
5. When Seedship Broodtender enters, it and Boss's Chauffeur trigger, causing you to mill three cards and put a +1/+1 counter on Boss's Chauffeur.
6. Resolve the Warren Soultrader ability, creating a Treasure token.
7. Activate Warren Soultrader by paying 1 life and sacrificing Boss's Chauffeur.
8. When Boss's Chauffeur dies, it and Cruel Celebrant trigger.
9. Resolve the Cruel Celebrant trigger, causing you to gain 1 life and each opponent to lose 1 life.
10. Resolve the Boss's Chauffeur trigger, creating a 1/1 Citizen creature token for each +1/+1 counter on it.
11. Resolve the Warren Soultrader ability, creating a Treasure token.
12. Activate Warren Soultrader by paying 1 life and sacrificing a Citizen.
13. When the Citizen dies, Cruel Celebrant triggers, causing you to gain 1 life and each opponent to lose 1 life.
14. Resolve the Warren Soultrader ability, creating a Treasure token.
15. Repeat from step 12 two additional times.
16. Activate five Treasures by tapping and sacrificing them, adding 3.
17. Activate Seedship Broodtender by paying 3 and sacrificing it.
18. When Seedship Broodtender dies, Cruel Celebrant triggers, causing you to gain 1 life and each opponent to lose 1 life.
19. Resolve the Seedship Broodtender ability, returning Reveillark from your graveyard to the battlefield.
20. Repeat.

This intricate loop relies on Warren Soultrader as a reliable sacrifice outlet that funds its own activations with Treasures while triggering Cruel Celebrant to drain your opponents out of the game. Reveillark provides the engine's recursion, pulling back Boss's Chauffeur and Seedship Broodtender whenever it hits the graveyard. As Boss's Chauffeur enters and eventually dies, its accumulated counters generate an army of Citizen tokens that can be fed to Warren Soultrader for extra mana and death triggers. Finally, Seedship Broodtender mills your library and uses its activated ability to recycle Reveillark back to the battlefield, ensuring the entire cycle can repeat indefinitely.