Wonder Energy (Mirror Holofoil) is a non-rarity card from the SM: The Best of XY set, identified as #170/171 in the Pokémon trading card game. Currently valued at $19.98, it appeals to collectors due to its unique holofoil design and role in gameplay, particularly in Energy strategies. The card's Japanese variant adds to its desirability among enthusiasts of the series, reflecting its significance in the broader market.