Warren Soultrader + Seedship Broodtender + Reveillark + Boss's Chauffeur + Popular Egotist

Warren Soultrader

Seedship Broodtender

Reveillark

Boss's Chauffeur

Popular Egotist

How it works

1. Activate Warren Soultrader by paying 1 life and sacrificing Reveillark.
2. When Reveillark dies, it and Popular Egotist trigger.
3. Resolve the Popular Egotist trigger, causing you to gain 1 life and target 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 Popular Egotist trigger.
9. Resolve the Popular Egotist trigger, causing you to gain 1 life and target 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, Popular Egotist triggers, causing you to gain 1 life and target 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, Popular Egotist triggers, causing you to gain 1 life and target opponent to lose 1 life.
19. Resolve the Seedship Broodtender ability, returning Reveillark from your graveyard to the battlefield.
20. Repeat.

This intricate loop revolves around Warren Soultrader acting as the ultimate sacrifice outlet to continuously feed your graveyard while generating Treasures. Reveillark is the linchpin that brings back smaller threats like Seedship Broodtender and Boss's Chauffeur whenever it leaves the battlefield, while Boss's Chauffeur ensures you always have extra bodies to sacrifice after accumulating counters. Meanwhile, Popular Egotist sits quietly on the battlefield turning every single one of those countless sacrifices into a direct drain on your opponents' life totals.