sun and moon booster box burning shadows Pokemon – Grail Collectibles AZ Organize your collection in the collectors box with 4 dividers! S&M Burning Shadows Pokémon Booster

10 Purrely Adopt A Cat Purrely is a cute archetype due to its two main monsters

That's pretty synergetic here

Pendulum Effect: Once per turn: You can Special Summon this card from your Pendulum Zone, then Special Summon from your Extra Deck, 1 "Rebellion" or "The Phantom Knights" monster, using this card as material (this is treated as an Xyz Summon), then you can attach 1 card from your Pendulum Zone to it as material

This was done by Sid himself and information on marking the boxes can be found here or viewed in the images of this listing

Playing that same deck at a pickup game at your local card store is different