Greta, Sweettooth Scourge is a uncommon Legendary Creature — Human Warrior card from Wilds of Eldraine (WOE), collector number 205. Current market price: $0.34 (foil $0.35), TCGplayer market prices via Scryfall.
When Greta enters, create a Food token. (It's an artifact with "{2}, {T}, Sacrifice this token: You gain 3 life.") {G}, Sacrifice a Food: Put a +1/+1 counter on target creature. Activate only as a sorcery. {1}{B}, Sacrifice a Food: You draw a card and you lose 1 life.