I've got an idea for a Champion...

I've had an idea.

What if there was a Champion that had two different autoattacks, based on their distance from their target? These two different modes would scale off of AP or AD depending on the mode - AP for ranged, AD for melee. And this champion's skills - all of them - would focus on either creating or eliminating distance between the champion and their target. The champion would have two viable builds - full AP for ranged, and full AD for melee. I think the champ could work best as an assassin, with powerful melee and ranged specials that cause stuns. Ranged fighting would be good for hit and run tactics, and you could close for burst damage.

How do you think this champ might work competitively? Do any of you have any ideas that would improve and/or balance this champion? What are your thoughts on this?