User blog comment:Deshiba/Item concept; Guinsoo's Rageblade remake./@comment-5333760-20130521060122

this sounds good except that you'll lose 2 major stats from 2 core items... when you get either haunting guise or brutalizer, the stat that you want is the flat armor and magic pen, not the AD or AP it gives. and since only few champs benefit from having both armor and magic pen (about 3, jax,akali,kayle), it would be too expensive for a situational item.

the concept why rageblade increases attackspeed is that most champs that uses it are on-hit champs (champs that rely on on-hit effect like skill). Champs like jax, kayle or poppy(yeah, i build rageblade on him) have kit that scales well with attack speed and i think because having both AD and AP bonus on an item would deem it unbalanced on then champs (the old passive of kayle wherein ad turns to ap and vice versa would deem it too OP as well as jax old ulti gaining health from AD and AP)