Warren Soultrader + Seedship Broodtender + Reveillark + Boss's Chauffeur + Soul's Attendant

Warren Soultrader

Seedship Broodtender

Reveillark

Boss's Chauffeur

Soul's Attendant

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, Soul's Attendant and Boss's Chauffeur trigger.
4. Resolve the Soul's Attendant 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, Soul's Attendant 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, Soul's Attendant triggers, causing you to gain 1 life.
17. Repeat.

This intricate loop revolves around Warren Soultrader acting as a reliable sacrifice outlet that turns your creature base into fuel, generating treasures and fueling your graveyard. Reveillark functions as the ultimate engine for recursion, pulling back Seedship Broodtender and Boss's Chauffeur whenever it hits the graveyard, while Seedship Broodtender eventually returns Reveillark using the mana filtered from your accumulated treasures. Meanwhile, Soul's Attendant buffers your life total against the costs paid to Warren Soultrader, and Boss's Chauffeur multiplies your fodder by turning its growing counters into a swarm of Citizen tokens that help sustain the sacrifice loop indefinitely.