hybird miss fortune?

MF is just stupid in regards to her abilities lol.

hybrid does work but is generally more expensive in consideration to damage output than pure AP or AD builds on champions who aren't utilizing both damage types frequently, which is why people tend to shy away from them in favor of one over the other. before considering her raw damage potential, consider how your going to play her. Are you playing a hybrid Attack carry or are you playing a hybrid caster. The build you have here leans slightly more towards the latter over the former.

IMO

Would lend itself a bit more to AA roles, while letting you keep a bit of punch in your abilities. It would also allows for heightened damage at something of a cost Clever passive Amps Your ult damage and hurricane can help make sure your hit multiple people with full stacks of impure before you fire off your R. This is what I tend to use if I play MF though not specifically in this order. You could also considering running some (but not alot) of AP in your runes or masteries so you wouldn't have to rely solely on your build.

Long story short though MF is in a weird place, mostly do to the conditional nature of getting maximum value out of her ult when compared to the timing and positions you want to fire it from. You can't base too much power around her ult performance because you'll lag behind but you don't want her abilities to have no impact in the late game considering how often you get punished for channeling it in the wrong position. She can technically build a ton of different items to be relatively effective with so almost anything you think will work probably will to some degree. It'll all come down to other factors: enemy team comp, your comp and your personal skill with her more than any build you run.

or

is just terrible, needs some serious rework