Activate Umbral Collar Zealot twice by sacrificing a nontoken creature you control and Slimefoot and Squee.
When the creatures die, Pitiless Plunderer triggers twice, creating two Treasure artifact tokens.
Resolve the Umbral Collar Zealot abilities
Activate the Treasures by tapping and sacrificing them, adding two of , or .
Activate Slimefoot and Squee by paying and sacrificing a Saproling.
When the Saproling dies, Pitiless Plunderer triggers, creating a Treasure artifact token.
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.
Activate the Treasure by tapping and sacrificing it, adding .
Repeat.
This clever graveyard loop uses Slimefoot and Squee as your recursive engine, bringing itself and another creature back repeatedly by feeding a sacrificed Saproling into its activation cost. Pitiless Plunderer acts as the financial backbone, generating a steady stream of Treasure tokens off every death to help pay for those activations and fuel future loops. Meanwhile, Embalmer's Tools quietly shaves the activation cost down to make the math work out smoothly, while Umbral Collar Zealot provides the initial sacrifice outlet to send your creatures to the graveyard in the first place and keep your library filtered.