When Cauldron Familiar enters, it and Weapons Manufacturing trigger.
Resolve the Cauldron Familiar trigger, causing each opponent to lose 1 life and you to gain 1 life.
Resolve the Weapons Manufacturing trigger, creating a Munitions artifact token.
Activate Ashnod's Altar by sacrificing Cauldron Familiar.
Activate Cauldron Familiar by sacrificing the Munitions, as it is a Food due to Ragost.
The Munitions triggers, dealing 2 damage to any target.
Resolve the Cauldron Familiar ability, returning it from your graveyard to the battlefield.
Repeat from step 2.
This delightfully chaotic loop turns your entire battlefield into a culinary disaster zone, starting with Mycosynth Lattice making every permanent an artifact so that Ragost, Deft Gastronaut can generously classify them all as Foods with its built-in activated life-gain ability. When you cast Cauldron Familiar, its entry triggers along with Weapons Manufacturing, which immediately churns out a Munitions artifact token ready to punish opponents when it leaves. You then feed the cat to Ashnod's Altar for mana, and use that very same mana to sacrifice the Munitions-turned-Food to resurrect Cauldron Familiar right back to the battlefield. The Munitions token's departure triggers its own 2 damage ping, while Ragost untaps at the end step if needed, ensuring this loop can endlessly recycle your furry familiar into infinite damage, life, and mana.