This skill is ineffective by itself. With only a 25% miss rate, the opponent would have to attack an average of 20 times just to recover the energy cost, at 12+ Inspiration Magic. Therefore, it would be wise to combine it with blindness, blocking, or additional accuracy-reducing hexes like Blurred Vision to both increase the chance to missing and thereby increase the energy gained.
This skill can be used to offset the energy loss of Distortion. Depending on your Inspiration magic attribute, this can result in gained energy.