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It's a very nice back design, to be sure. I would consider perhaps making a "stinger-style" border on them, where the pattern fades out to white towards the edge of the cards. The reason for this is that your design is extremely dependent on the cards being cut perfectly centered - if they aren't, you wind up with a one-way back design, something a lot of card players avoid using (it's often used by card cheats - you can orient desirable cards in one direction and the rest of the cards in the other, thus knowing when the desirable ones are dealt). While there are some good card makers out there, the kind of perfection you'd need to avoid having a one-way back is pretty uncommon, if not rare. Depending on exactly how they wind up getting cut, it might even be possible for a sharp-eyed player to spot those card orientations from the EDGE of the deck, due to how your design is printed into the bleed, past the edge of the card. I've done this before with other decks, even demonstrated it on a YouTube video - I was even able to cut to a given reversed card in the deck, as if it was a magician's stripper deck.
It's because of this that casinos for the most part have moved away from decks with designs that are printed into the bleed. They often used a fade-to-white border (often called a stinger border because it was first popularized by Bee Stingers, though it's often seen on Aristocrats as well) if not just a plain, hard-white border. Some casinos take this to an extreme - when I was in Las Vegas for Magic Live 2019, the hosting casino, the Orleans, was using decks that had the casino logo on back, oriented both ways, and absolutely nothing else: there was no pattern, no other printing, just a field of white behind those two logos.
Looking forward to seeing more of your design, when it's ready!