The M Gengar EX XY166 XY Holo is a speciality EX card from the Pokémon TCG XY set, featuring a Mega stage with 210 HP. This rare promo card, manufactured by The Pokémon Company, showcases the powerful Pokémon Gengar in a holographic finish, making it a highly sought-after collectible for fans and players alike. With its unique attributes and special abilities, the M Gengar EX card is sure to enhance any Pokémon TCG collection.