@RiotScruffy: What are your thoughts on a Champion whose AA's deal purely magic damage?
Since you were nice enough to respond to two of my other topics recently, I've got another question for you.
For some time, I've been trying to think up a way to make a Champion who is autoattack-oriented, scales off attack damage, but deals PURELY magic damage. All other Champions (mages included) deal physical with their AA's, and have to get on-hit procs to add magic damage to them, but in this case, the AA would be magic only.
Here's my current rough idea for it, in the form of an innate passive:
Mageblade Your basic attacks deal magic damage instead of physical damage, but cannot critically strike. Critical chance instead grants you % penetration against bonus magic resistance (this includes MR from runes, masteries, buffs, and items), up to a cap.
Would this be unhealthy design in principle? Or could it be done with proper tweaks?
EDIT:
doesn't count, as he doesn't scale off attack damage.

as well with her impure shots (w)
(drinking at a bar)
(enters the bar, sits down next to Morde looking depressed)


all for the express purpose of blunting auto-attacks.
and
would do a lot against this Champion.
Making it rather hard to deal with as I assume it wouldn't convert on-hit effects to magic damage
And I would assume that 
