Unown (Mirror Holofoil) is a collectible card from the SM: The Best of XY set, classified as a None rarity Holofoil with the card number #046/171. Currently valued at $18.98, it appeals to collectors for its unique design and the significance of the Unown Pokémon in the franchise. As part of a limited Japanese release, its market presence reflects the ongoing interest in nostalgic cards from earlier sets.