Nidoking δ is a Rare Holofoil card from the Dragon Frontiers set, noted for its unique Delta Species designation that introduces different types for many Pokémon. Currently valued at $25.83, this card is sought after by collectors for its distinctive artwork and gameplay utility. As part of a limited series, it maintains a notable presence in the market, reflecting its appeal among fans of both the trading card game and the Pokémon franchise.