Frost Marsh [Foil] is a card from the Coldsnap set of Magic: The Gathering, classified as an Unknown rarity (card #146). As a dual land that provides both blue and black mana, it holds strategic value in various decks. Currently valued at $5.12, its foil version appeals to collectors and players alike, reflecting its significance in the game's competitive landscape. The card's unique art and functionality contribute to its demand in the market.