Activate Selvala by paying and tapping it, adding at least 1.
Activate Umbral Collar Zealot twice by sacrificing Selvala and Slimefoot and Squee.
Activate Slimefoot and Squee by paying 1 and sacrificing a Saproling, returning it and Selvala from your graveyard to the battlefield.
When Slimefoot and Squee enters the battlefield, it triggers, creating a 1/1 Saproling creature token.
Repeat.
This loop relies on a clever loop of sacrifice, resurrection, and mana generation to fuel an engine of relentless recursive value. You begin by tapping Selvala, Heart of the Wilds for a massive burst of green and colored mana, which is then used alongside Umbral Collar Zealot to sacrifice key pieces and set up your graveyard. Slimefoot and Squee steps in to bring both itself and Selvala right back to the battlefield from the graveyard while conveniently producing a fresh Saproling token upon arrival. Finally, Garna, the Bloodflame ties the whole operation together by granting your team haste, ensuring every returning piece is immediately ready to contribute its abilities back to the chain.