Dina, Soul Steeper is a uncommon Legendary Creature — Dryad Druid card from Strixhaven: School of Mages (STX), collector number 178. Current market price: $0.23 (foil $0.28), TCGplayer market prices via Scryfall.
Whenever you gain life, each opponent loses 1 life. {1}, Sacrifice another creature: Dina gets +X/+0 until end of turn, where X is the sacrificed creature's power.