Hydreigon - SWSH037 (Prerelease) [Staff] is a Holofoil variant from the SWSH: Sword & Shield Promo Cards set, categorized as a Promo rarity card. Currently valued at $103.00, it appeals to collectors due to its limited availability and unique prerelease designation. With 119 copies graded by PSA and a gem rate of 31.9% for PSA 10, its market presence reflects both demand and the competitive nature of Pokémon card collecting.