Bubbling Cauldron is a uncommon Artifact card from Jumpstart (JMP), collector number 460. Current market price: $0.32, TCGplayer market prices via Scryfall.
{1}, {T}, Sacrifice a creature: You gain 4 life. {1}, {T}, Sacrifice a creature named Festering Newt: Each opponent loses 4 life. You gain life equal to the life lost this way.