Core Deck Case

"Core Deck Cases" are special deck cases used in the Future Card Buddyfight anime, they are built using Photon Metal.

When a person finds and becomes Buddies with a monster (normally by finding a Buddy Rare card), they are given a Core Deck Case by a Buddy Police officer. Core Deck Cases allow the user to "Luminize" their decks, allowing them to have a Buddyfight at any time together with their monsters, as well as using their Buddy Monster's abilities (such as flying). When activated, Core Deck Cases transform into "Core Gadgets" with different forms; they appear to transform into something that fits their users, like a Sun belt for Gao, a Katana for Zanya, etc. During a Buddyfight, Core Gadgets automatically draw cards for players, shuffle their hands, and summon the monsters in battle while an automatic voice guides the player during their respective turns. Players who do not possess their own Core Deck Case can use an all-purpose Core Gadget to luminize their decks when fighting against someone who does own a Core Deck Case.

Known Dark Core Deck Cases
A "Dark Core Deck Case" gives its owner the ability to turn the power of the cards or the cards themselves real and appears to be related to Demonic Dragon, Azi Dahaka, and makes the user more malevolent and power hungry. They can also be used to posses others, as seen with Doai. Dark Cores are black in appearance and have an eye-like figure over the crystal.