When Jayce gets nerfed
When he does get nerfed ( it's not really an if) this is what I want to see nerfed.
Get rid of his ability to move through units every time he changes form.
Change or lower the max health damage from his E.
Nerf or remove the passive armor and magic resistance from his hammer form.
Maybe increase his mana costs.
After the changes in items and mana, his power curve became overtuned since the thing keeping his damage in check (mana) stopped being an issue and he can just build straight damage. Also currently the counter play available against him is almost non existent if your a melee champion and your name is not Poppy or Irelia.