User blog comment:Zilla4444/AP Version of Black Cleaver/@comment-4434378-20120612185822

Eh, its basically 24 MPen for spam casters. Not to mention you have to come up with when does it proc?

I'd much rather see an upgrade for Malady so that its more appealling to casters, like this:

Glamdring

Malady + Needlessly Large Rod + 375gp = 3800gp

120 AP

50% AS

Unique passive: On-hit that shreds 10 MR from target, stacks 5 times and lasts for 5 seconds

Unique passive: On-hit that deals 30 + .2 AP magic damage

This item would basically help certain casters scale into late game, as it makes their AA hurt a lot. A mage with 300 AP would deal 90 damage per swing and begin shredding. It would bring in more of that DotA style "everyone AA" style into the late game.