Activate Viscera Seer twice by sacrificing a nontoken creature you control and Slimefoot and Squee.
When the creatures die, Pitiless Plunderer triggers four times, creating four Treasure artifact tokens.
Resolve the Viscera Seer abilities, causing you to scry 1 twice.
Activate the Treasures by tapping and sacrificing them, adding 1.
Activate Slimefoot and Squee by paying 1 and sacrificing a Saproling.
When the Saproling dies, Pitiless Plunderer triggers twice, creating two Treasure artifact tokens.
Resolve the Slimefoot and Squee ability, returning it and another creature from your graveyard to the battlefield.
When Slimefoot and Squee enter the battlefield, it triggers, creating a 1/1 Saproling creature token.
Repeat.
This loop turns a graveyard into an engine for infinite resources by weaving together sacrifice outlets, token generators, and mana production. Viscera Seer provides the initial sacrifice engine to send your creatures to the graveyard, while Pitiless Plunderer fuels your mana supply by turning every single death—and thanks to Teysa Karlov, extra triggered abilities—into a steady stream of Treasure tokens. Slimefoot and Squee sits at the heart of the recursion, using those Treasures and a sacrificed Saproling token to continuously pull itself and another creature back from the graveyard, automatically churning out fresh Saproling tokens whenever it enters the battlefield anew.