An idea to update Mordekaiser's Q for the time being
I'm not expecting a Mordekaiser rework anytime soon, but maybe an interim change will help things along.
Mace of Spades Mordekaiser's next three basic attacks are empowered. The first two cleave, dealing X damage in an arc in front of him. The third attack hits a single target, but deals much more damage.
This is meant to emulate Leoric's basic attack style in Heroes of the Storm. He basically gets this, but it's one half of his trait/passive. Changing it to this would not only make it more interesting, but also would just make sense on him. It'd give him even better waveclear, and also more AOE damage in team fights.
And for those who knee-jerk react to this, assume Riot would adjust Mordekaiser's numbers if this would make him broken on its own.