I've been playing for a while now and I think I can safely say that magic luck is impossible to prove. I have no reason to believe that MCC's don't give you the magic luck Paul says it does, and even if I did I have no idea how one would go about testing this.
In my opinion, it's really better to not think about things like this too much or else you'll get caught up in NEEDING to find a good drop, and that's the sort of thing that doesn't happen magically. Just play the game a lot and you'll find something good eventually

I wouldn't be stressin' about this personally