Mega Greninja ex is a Black Star Promo from the Pokémon Mega Evolution set, released in 2026 and catalogued as card number 81. Black Star Promos have long served as a home for special cards outside the regular numbered set, often tied to releases, events, and product launches, which gives collectors a distinct corner of the hobby to follow. Mega Evolution, the era this card belongs to, brought a fresh wave of Mega-form Pokémon back into focus, and many collectors remember these promos as a bridge between the core set and the wider community of players and collectors. Greninja has been a fan favorite since its introduction, known for its agile, ninja-inspired design and its strong presence in competitive play. This Mega form pushes that identity further, and collectors are drawn to how the artwork captures the Pokémon's sleek, dynamic energy. Holding a piece of the species in its Mega form is a satisfying reminder of why this Pokémon has remained so beloved across generations.