Warren Soultrader + Seedship Broodtender + Reveillark + Boss's Chauffeur + Venerated Stormsinger

Warren Soultrader

Seedship Broodtender

Reveillark

Boss's Chauffeur

Venerated Stormsinger

How it works

1. Activate Warren Soultrader by paying 1 life and sacrificing Reveillark.
2. When Reveillark dies, it and Venerated Stormsinger trigger.
3. Resolve the Venerated Stormsinger 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 Venerated Stormsinger trigger.
9. Resolve the Venerated Stormsinger 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, Venerated Stormsinger 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, Venerated Stormsinger 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 turns the sacrifice engine of Warren Soultrader into a lethal drain and a fountain of infinite value. With Venerated Stormsinger acting as your blood-pact tax collector, every creature sent to the graveyard drains your opponents while padding your life total. Meanwhile, Reveillark and Seedship Broodtender act as a revolving door of resurrection, recycling each other while Boss's Chauffeur steps in to multiply your sacrificial fodder into a swarm of tokens and generate the treasures needed to sustain the loop indefinitely.