Forum talk:Neekerivittu/@comment-6526049-20130819193948/@comment-4834593-20130826084815

I think to bring some variety for casters. Because of the AD casters (like Zed) there are casters that deal magic damage, and physical damage, which just means there is more variety. And because Riot wants champions building AP to be countered by magic resistance, and champions building AD to be countered by armor, or the other way around (countered by magic resistance = building AP, countered by armor = building AD), so if you make a caster countered by armor, he should build AD.