This is literally exactly the same as casting a curse. The three fold law is Wiccan dogma not a law of physics, so there is not bad karma for cursing. This is not even how karma works. Stop being holier then thou!
There are many kinds of magic tricks, but most fall into one of a few categories. Oftentimes, a magician will specialize in one or a few areas. For those who employ a range of techniques, they will often develop some type of persona o