Linden, the Steadfast Queen is a rare Legendary Creature — Human Noble card from Throne of Eldraine Promos (PELD), collector number 20p. Current market price: $0.38 (foil $0.94), TCGplayer market prices via Scryfall.
Vigilance (Attacking doesn't cause this creature to tap.) Whenever a white creature you control attacks, you gain 1 life.