Cornerstone Mask Ogerpon ex is a rare full-art Pokémon TCG trading card from the 2025 Prismatic Evolutions expansion. It showcases Ogerpon wearing its unique Cornerstone Mask against a prismatic holofoil background, illustrated by Iban Graphics with glowing crystal shards and dynamic orange highlights. This EX card has 210 HP, the “Cornerstone Stance” Ability (which blocks damage from any Ability-using opponent Pokémon), and a 140-point “Demolish” attack that ignores Weakness and Resistance. The card’s vibrant artwork and sparkling foil finish give it strong collector appeal, while the classic EX rule (two Prize cards if it’s Knocked Out) adds extra strategic value for players.