Dina, Soul Steeper is a uncommon Legendary Creature — Dryad Druid card from The List (PLST), collector number STX-178. Current market price: $0.21, 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.