Ragost, Deft Gastronaut is a rare Legendary Creature — Lobster Citizen card from Edge of Eternities Promos (PEOE), collector number 224p. Current market price: $0.37 (foil $0.73), TCGplayer market prices via Scryfall.
Artifacts you control are Foods in addition to their other types and have "{2}, {T}, Sacrifice this artifact: You gain 3 life." {1}, {T}, Sacrifice a Food: Ragost deals 3 damage to each opponent. At the beginning of each end step, if you gained life this turn, untap Ragost.