Infinite Reflection attached to Brandywine Farmer.
You control a Food.
Dark Privilege attached to any other creature you control.
Steps
Activate Cauldron Familiar by sacrificing a Food, returning it to the battlefield from your graveyard as a copy of Brandywine Farmer due to Infinite Reflection.
When Cauldron Familiar enters the battlefield, it triggers, creating a Food artifact token.
Activate Dark Privilege by sacrificing Cauldron Familiar.
When Cauldron Familiar dies, it triggers, creating a Food artifact token.
Resolve the Dark Privilege ability, regenerating target creature.
Repeat for infinite Food tokens.
Activate Dark Privilege by sacrificing Brandywine Farmer.
When Brandywine Farmer dies, it triggers, creating a Food artifact token.
Resolve the Dark Privilege ability, regenerating target creature.
Activate Cauldron Familiar by sacrificing a Food, returning it to the battlefield from your graveyard.
When Cauldron Familiar enters the battlefield, it triggers, causing each opponent to lose 1 life and you to gain one life.
Activate Dark Privilege by sacrificing Cauldron Familiar, regenerating target creature.