"Double Rainbow Energy," a Reverse Holofoil variant from the Crystal Guardians set (#88), is categorized as a Rare card and currently valued at $10.53. Over the past month, it has appreciated by 10.6%, reflecting a growing interest among collectors. With 17 copies graded by PSA, the card has an 11.8% gem rate for PSA 10, indicating its potential for high-quality investments within the Pokémon trading card market.