Why spell magick with a k?
We (a lot of us, anyway) spell magick with a ‘k’ to distinguish it from the illusions of rabbit-out-of-a-hat magicians (and, more recently, from the ‘magic’ done on shows like Sabrina the Teenage Witch and Charmed). This practice was begun by Aleister Crowley, as far as we know, possibly for a couple of reasons – either it really is the archaic spelling of ‘magic’, or he wanted to set it apart from the rabbit-out-of-a-hat stuff (we can’t ask him now, because he died in 1947). Some people will call you a fluffy bunny for adding the ‘k’, but don’t let that bother you.