Mordekaiser's Phantom Dragon problem

His Phantom Dragon is the only thing that is preventing Mordekaiser from seeing any meaningful changes or buffs due to the severe fear of making him broken. For the most part I dont blame them. I personally would like to see it be removed as a whole and perhaps transfer it's power to his other abilities.

If that were to happen, I would like to see a change to his W the most. Where you wont need another friendly unit near you to proc it's damage over time but most of all, have the friendly towers be targetable but not being able to heal it. I think the later would benefit him the most as it would act as a mini Point Runner passive and to help protect towers from sieges.