Why has Ryze been reworked so many times?

Does anyone know why has Ryze seen so many changes to his kit over the years,it's odd how they can't seem to find the time to rework Mordekaiser or Aatrox who are basically unplayable,yet they reworked Ryze so many times,and i think another rework is coming soon for him? Also why did they change his old ult,it felt so much better to use it and go ham,this new ult is seldom used properly,it usually gets used just to cut someone off,or even better to teleport you whole team in place for a wombo combo that loses you the game
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