Activate Spawning Pit's first ability by sacrificing Cauldron Familiar.
Activate Cauldron Familiar by sacrificing a Food, returning Cauldron Familiar to the battlefield from your graveyard.
Cauldron Familiar and Teval trigger.
Resolve the Teval trigger, creating a token and a Food token.
Resolve the Cauldron Familiar trigger, causing each opponent to lose 1 life and you to gain 1 life.
Repeat
This elegant death-loop harnesses Peregrin Took's replacement effect to turn a modest snack into a factory of infinite resources. You sacrifice Cauldron Familiar to Spawning Pit, fueling Teval, the Balanced Scale's trigger whenever cards leave your graveyard; Peregrin Took then steps in to upgrade the resulting Zombie Druid token into both a token and an extra Food. This cascade leaves you with more than enough sustenance to repeatedly revive the Cat, draining your opponents' life totals while generating infinite sacrifices, tokens, and life.