Alpine Moon is a rare Enchantment card from Core Set 2019 (M19), collector number 128. Current market price: $0.30 (foil $1.07), TCGplayer market prices via Scryfall.
As this enchantment enters, choose a nonbasic land card name. Lands your opponents control with the chosen name lose all land types and abilities, and they gain "{T}: Add one mana of any color."