Castle Ardenvale is a rare Land card from Throne of Eldraine Promos (PELD), collector number 238p. Current market price: $2.77 (foil $1.73), TCGplayer market prices via Scryfall.
This land enters tapped unless you control a Plains. {T}: Add {W}. {2}{W}{W}, {T}: Create a 1/1 white Human creature token.