Yeah, I'm in the group with gregory and cloraspexa and nisaba. They're my tools of my trade, so to speak, so I take reasonable care of them. Reasonable means not letting the puppy chew on them or my great-grandson play with them (I gave him a deck with pretty cards but some missing, and he plays with those. He's 3 years old.) Other than that, though, I let others shuffle them if it's an in-person reading---I actually prefer them to handle the deck. And I keep them in whatever keeps them from blowing or falling all around. Right now I've a shortage of bags, so some of my bags house two decks, and my Connolly is in a tin with the Tower from the Hudes was in but the Hudes is now bunking in with the Wild Spirit. They're having a sleepover till I'm through using the Hudes tin to house the Connolly. My Touchstone is somewhere bunking in with another deck but I've forgotten which one because my Anna K needed to borrow the box.
I adore my cards. Don't get me wrong. But I'm not foo-foo about them. They're just cards and I take care of them like I take care of my beading tools and any other kind of tools.
However, this doesn't mean that I'm totally pragmatic about them. My decks are like food for my soul. It's kind of like they're on the thread that connects my spirit in the Universe and they're just kind of hanging there in between my heart and where I came from. But the cards themselves aren't needing any kind of special tending other than what I mentioned. They're just card stock, ink, and lamination. I think if I were to allow myself to fall into thinking I had to protect them and treat them as sacred objects. they wouldn't serve the purpose they're supposed to. They'd become the end all and be all---I'm not sure how to express it. But it would shift the focus onto them instead of allowing the communication between me and The Great Whatever Is Out There to flow freely using the cards as a tool of communication.
Anyhow, I just keep them from destructive things (which I don't believe includes bad spirits and evil energy from others touching them) and that's the care I take of them.