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 clever loop transforms graveyard recursion into an engine that churns through your entire deck. By leveraging the mana-generating prowess of Selvala, Heart of the Wilds alongside the self-returning loop of Slimefoot and Squee, you can repeatedly sacrifice and revive your board. Umbral Collar Zealot acts as the crucial sacrifice outlet that lets you bin the key pieces while fueling your graveyard, while Yarus, Roar of the Old Gods fills out the team by granting haste to any threats you manage to churn out.