If you want Malz to be an AP Carry Midlaner
The passive has to be changed. When he was reworked, his passive turned out to be so strong that a bunch of power had to be redistributed from the rest of his power budget.
If you want him to be an APC, the passive has to go. Its going to slowly siphon the damage out of his kit again. It happened after his rework and its already happening again.