Activate Selvala by paying and tapping it, adding at least 1.
Activate Woe Strider 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 recursive loop lets you feed Woe Strider's hunger by sacrificing Selvala, Heart of the Wilds and Slimefoot and Squee to the goat-herder, generating scry triggers while fueling your graveyard. Once your legends are in the dirt, you pay the activation cost of Slimefoot and Squee to bring them both right back to the battlefield, a resurrection made instantly lethal and seamless thanks to the haste granted by Tannuk, Steadfast Second. The newly returned Slimefoot and Squee immediately spits out a fresh Saproling token to pay for the next cycle, while Selvala taps to harvest a massive wave of colored mana that easily outpaces your revival costs.