I am curious as to whether there is a Magic SE community or whether this is the closest thing to it. I know that there was a Magic SE put forward in Area 51 but it was closed. If some are allowed, what sorts and in what kind of context?
There is no site in the network which currently accepts these question, as e.g. indicated in this Meta Stack Exchange question: Candidate SE site for asking about AGT Magics tricks. An Area 51 proposal would make sense but without an existing userbase (partially from elsewhere on the Internet) there is a very low chance that it's successful. After all, most professionals in this business don't want to explain anything but the most basic tricks.
Sometimes it's possible to reframe a card trick into a puzzle, by describing a sequence of actions by a magician and a volunteer, and asking how the magician is able to name the correct card every time. An example is the puzzle Five Card Magic Trick with $N$ card Deck. You can browse the magic tag to see what kind of magic questions are acceptable on this site.