Yeah it works but I can tell you that it`s much more efficient to simply train until you can use it normally, average amount of time needed(few months on average for normal way/training to show results) in comparison method mentioned in this "spell/ritual" could take up to several years to get past the basics and that would be just about only thing it would be good for.
I would call this a ritual, not a spell, but yes, it works in theory. Using this "spell" when you should just practice and do work to improve your abilities, is kind of a short cut. It's far more rewarding the long way, but your choice. Just remember we all have the ability to do magic, you don't need a spell, lineage, or ritual to unleash it. Learn what magic is and connect with it.