weiss schwarz kadokawa sneaker bunko booster box Weiss Schwarz Kadokawa Sneaker Bunko Vol. 2 Booster Box (Japanese) [Sealed]

Mastemon is one of the cards from the Illustration Celebration Pack, which is a box topper pack for the Booster

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Each purchase includes only 1 Booster Pack (Random Design)

For example, you might come across an awe-inspiring card like this secret rare Zekrom card (pictured below), and its entirely gold-painted artwork: Yet, where you might find a very obvious example of a secret rare like that golden Zekrom, you may also find exceptionally hidden secret rare cards, which might go unnoticed if you dont check twice

Special Summon it, but neither player can activate its effects this turn