Kastral, the Windcrested is a rare Legendary Creature — Bird Scout card from Bloomburrow (BLB), collector number 335. Current market price: $1.69 (foil $2.71), TCGplayer market prices via Scryfall.
Flying Whenever one or more Birds you control deal combat damage to a player, choose one — • You may put a Bird creature card from your hand or graveyard onto the battlefield with a finality counter on it. • Put a +1/+1 counter on each Bird you control. • Draw a card.