TCG, this works by having five distinct Exodia cards: Exodia the Forbidden One, Right Leg of the Forbidden One, Left Leg of the Forbidden One, Right Arm of the Forbidden One and Left Arm of the Forbidden One
I've used him and seen him used in many forms of casual Magic throughout the years and it's not hard to see why
Honestly, there are plenty of cards that target Attribute monsters (spiritual arts, dark eruption, circle of the fire kings, blue flame swordsman, wolfbark, Goka the pyre of malice, Mystic Macrocarpa seed, After the Storm, Harpie Dancer, Pilica, Quill Pen of Gulldos, etc), so these would be ridiculously helpful in any attributed deck, probably Fire King for the most part (although the deck is basically garbage)
If any of them are attached to creatures at that time, they become unattached
Ok Jolteon [1st Edition] #20 (Pokemon Jungle) Details All prices are the current market price
Truly, it is nothing particularly memorable as a game