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

Warren Soultrader

Seedship Broodtender

Reveillark

Boss's Chauffeur

Kor Celebrant

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

This intricate engine relies on Warren Soultrader to act as our primary sac outlet, turning our creatures into Treasures while fueling the loop's life payments. Whenever Reveillark leaves the battlefield, its delayed trigger brings back Seedship Broodtender and Boss's Chauffeur, allowing Boss's Chauffeur to accumulate counters and eventually flood the board with Citizen tokens upon death. Meanwhile, Kor Celebrant keeps our life total safely padded with every single creature entry, buffering the life costs required by Warren Soultrader. Finally, Seedship Broodtender bridges the loop together by using the accumulated mana from our sacrifices to resurrect Reveillark, repeating the cycle indefinitely.