Diantha - 105/131 (Regional Championships) [Staff] is a Reverse Holofoil variant from the Pokémon League & Championship Cards set, categorized as a Promo rarity. As a sought-after card among collectors, it currently holds a market value of $39.50. Its unique status as a staff promotional card enhances its appeal, making it an interesting addition for enthusiasts looking to strengthen their collections or invest in rare items within the Pokémon trading card market.