Beifong's Bounty Hunters + Thermopod + Sporemound

Beifong's Bounty Hunters

Thermopod

Sporemound

How it works

1. Activate Thermopod by sacrificing another nonland creature you control.
2. When the creature dies, Beifong's Bounty Hunters triggers, earthbending a land.
3. Activate Thermopod by sacrificing the land.
4. When the land dies, Beifong's Bounty Hunters triggers, returning the land from your graveyard to the battlefield tapped.
5. When the land enters, Sporemound triggers, creating a creature token.
6. Repeat.

This loop kicks off by feeding a creature to Thermopod's sacrifice outlet, which immediately triggers Beifong's Bounty Hunters to animate and pump a land through earthbending. Because that land is now also a creature, you can sacrifice it right back to Thermopod to generate red mana and send it to the graveyard, where Beifong's Bounty Hunters rescues it and returns it directly to the battlefield tapped. That new land entry triggers Sporemound to produce a fresh 1/1 green Saproling creature token, giving you the exact sacrifice fodder you need to feed right back into Thermopod and keep the cycle grinding indefinitely.