Too much power in single keystones
Some keystones are basically mandatory on certain champions and it's dumb. How about making champions actually good so that they don't need to rely on OP keystones to be viable?
Conqueror, for example, makes bruisers really good but as soon as you take the keystone away its pure tank meta top lane. Suggestion: reduce true damage from conqueror significantly, buff bruisers who only use that keystone.
Electrocute is another one. There's a good number of champions who ONLY use electrocute. Suggestion: nerf it until some people start using other keystones as well and maybe buff a few champions if they start struggling. Like, for example, Hail of Blades and Dark Harvest, which are also supposed to be burst keystones.
I can't remember any other problematic keystones that haven't already been nerfed. On the flipside, some keystones (specially sorcey) are pretty lackluster in design and power but that's another thread.
that he should have 1%-2.5% max hp heal on his Q if he hits a champion. Grasp is too mandatory on him for sustain and he is a jugg that needs it.