Nutrient Block is a common Artifact — Food card from Edge of Eternities (EOE), collector number 243. Current market price: $0.26 (foil $0.32), TCGplayer market prices via Scryfall.
Indestructible (Effects that say "destroy" don't destroy this artifact.) {2}, {T}, Sacrifice this artifact: You gain 3 life. When this artifact is put into a graveyard from the battlefield, draw a card.