Cauldron of Essence is a rare Artifact card from Secrets of Strixhaven Promos (PSOS), collector number 179p. Current market price: $3.15 (foil $4.40), TCGplayer market prices via Scryfall.
Whenever a creature you control dies, each opponent loses 1 life and you gain 1 life. {1}{B}{G}, {T}, Sacrifice a creature: Return target creature card from your graveyard to the battlefield. Activate only as a sorcery.