Stepping into the Pokémon time capsule of 2010, we find ourselves in the 'Clash at the Summit' expansion, a treasure trove within the 'Pokémon Card Game LEGEND' series. But what sets these cards apart from the rest is their 'Mirror' foil treatment, a bit like the cards decided to dress up for a glittering party. For collectors, these LEGEND series Mirrors are like shiny, elusive gems, and they often follow the expansion symbol in the bottom right corner (L3) like a treasure map.