Soul of Windgrace is a mythic Legendary Creature — Cat Avatar card from Dominaria United Promos (PDMU), collector number 220p. Current market price: $3.14 (foil $1.09), TCGplayer market prices via Scryfall.
Whenever Soul of Windgrace enters or attacks, you may put a land card from a graveyard onto the battlefield tapped under your control. {G}, Discard a land card: You gain 3 life. {1}{R}, Discard a land card: Draw a card. {2}{B}, Discard a land card: Soul of Windgrace gains indestructible until end of turn. Tap it.