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The first card to ever be banned for being excessively powerful was Super Energy Removal from the original Expansion Pack

While the One Piece Card Games cards have the same logo on each card, there are several different colors of card back in the game

Everyone with that ability is one of the main playable characters so it's only meant to be able to have any of them as your commander since abilities of cards count as their color identity so then It can be played as a 5 color deck

This means that you can fit split second cards into virtually any deck , either as a backup for a spell that you need, or as an alternative that your opponents can't deal with