chilling reign pokemon booster box SWSH including powerful new Pokémon V Pokemon Sword & Shield Chilling

The major reason a card will be banned in any TCG is to keep competitive play balanced by removing powerful and often game-breaking combos

After Axel uses Jim's Eye of Orichalcum on the Supreme King during a successful invasion of the Supreme King's castle, Jaden is freed from his possession, but is deeply tormented by the atrocities he committed during his possession, and he thus starts refusing to use his Fusion Monsters, as "Polymerization" and other cards that include Fusion Summoning remind him of the things he did while possessed, since the Supreme King mainly used Fusion Monsters

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During internal testing, this little artifact used to give a +1/+1 buff, just like an equipable +1/+1 counter