I'm a regular practitioner of magic, have written essays about it on Quora, and I can identify this mysterious third option as "the universe responding to your needs." You can use any number of religious terms to refer it to, like serendipity and the like, but none of them can capture the full texture of precisely how free will operates.

Approaching this subject from a rational perspective divorces you from subject and makes it impossible to perceive. You have to immerse yourself in it and one way to do that is magical practice. Having direct experience of the universe responding to your actions and mindset eventually makes it absurdly clear that the universe bears intelligence and it's in this intelligence that free will operates.

I'd never thought before now to connect magic this directly to free will. Thanks for the opportunity to think this through! If you're interested in a deeper discussion, happy to jump on a call.