Penumbra Wurm [Foil] is a creature card from the Magic: The Gathering Ultimate Masters set, categorized as an Unknown rarity. Valued at approximately $0.50, this card features a unique foil treatment that appeals to collectors and players alike. Its gameplay mechanics and thematic connections add to its desirability, though its market value remains modest compared to higher-end cards in the format. Collectors looking to complete their foil sets may find it a worthwhile addition.