Here is how you fix Mordekaiser in a way you can balance.

I am going to keep this short and sweet so as to not lose the point of the conversation. Of which, the point is to make a slight change to Mordekaiser so that he can be balanced in future patches. Currently a lot of pros have agreed that the new rework has no way of being balanced. If you are near an objective you can just ult the enemy jungler out of the map so they cannot smite the dragon or baron. If you build your AP/Tank hybrid build, you can just ult the enemy adc in team fights, win, or at the least remove their damage from the game. It feels pretty unfair when you take into consideration that his stats are also insane right now. This is a different issue that plagues any new champ or rework. Either they are super weak and get buffed into god tier, or they are already god tier on release and get nerfed into oblivion.

My suggestion to fix this is to simply make his ultimate the original Poppy ultimate, but with the area they cannot not escape from. How this differs is simple. He cannot take damage from the enemy team, but they can cc him or help (heal, shield, or body block) their teammate currently in the realm. The change I am suggesting does differ from current champions with zone locks in that he still keeps their stats (till they spawn) and cannot take damage from other champions. This also fixes the whole jungler debacle. They are still in the same realm as dragon and baron, which allows them to smite it. I fear if he stays in his current state he will be in a state of limbo of being game breaking or useless.

Let me know what you think. Taking any suggestions as well