Warren Soultrader + Seedship Broodtender + Reveillark + Boss's Chauffeur + Vengeful Bloodwitch

Warren Soultrader

Seedship Broodtender

Reveillark

Boss's Chauffeur

Vengeful Bloodwitch

How it works

1. Activate Warren Soultrader by paying 1 life and sacrificing Reveillark.
2. When Reveillark dies, it and Vengeful Bloodwitch trigger.
3. Resolve the Vengeful Bloodwitch 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 Vengeful Bloodwitch trigger.
9. Resolve the Vengeful Bloodwitch 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, Vengeful Bloodwitch 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, Vengeful Bloodwitch 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 clever sacrifice loop relies on Warren Soultrader as the engine that fuels the entire operation, turning your creatures into a steady stream of Treasures while Vengeful Bloodwitch converts every single death into an unescapable drain on your opponents' life totals. When you sacrifice Reveillark, its leaves-the-battlefield trigger pulls Seedship Broodtender and Boss's Chauffeur right back from the grave, with Boss's Chauffeur growing larger through its alliance ability and later cashing out its accumulated +1/+1 counters into a swarm of Citizen tokens when it hits the graveyard. Those tokens provide the extra fodder needed to generate enough mana, allowing Seedship Broodtender to use its activated ability to bring Reveillark back and restart the cycle infinitely.