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The cipher can be decoded by frequency analysis...but there are ways to counter that and make it unsolvable to 95%.
The overall nature is totally visual unless encoded with custom methods, but even the visual patterns can be encoded as a key for easy remembrance.
As indicated in picture the cipher is for classic deck of cards.
Still figuring out ways to use it while playing the game itself as My initial thoughts was for it to make a cheat tool for friendly gambling sessions.