"Swamp [Foil]" is a basic land card from the Magic Commander Masters set, classified as an Unknown rarity (#443). It plays a crucial role in mana production for black decks within the game of Magic: The Gathering. Currently valued at $2.29, its foil version appeals to collectors and players alike, contributing to its presence in the secondary market. As a staple land type, it remains a sought-after component for many deck strategies.