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A player can use a card protector that is not a card. While traditional card protectors are specifically designed to protect playing cards, there are no strict rules prohibiting the use of other objects as card protectors in many card games. However, it's important to note that the rules of the specific card game being played may have restrictions or guidelines regarding the use of card protectors. It's always a good idea to check the rules of the game or consult with the other players before using a non-standard card protector.