All you really need to do is look out for magic that is best for a stat. Like Meltdown is the best for vitality. You could try to junction yourself which may be hard seeing as you use a certain magic for 1 junction and then turn around and see it's better for another. Find a list of the magics best for a stat and stock 100 of those. Once you do you'll understand there is a perfect junction method and it isn't hard at all.