A katarina nerf idea
We all know that Katarina is fairly powerful, yet CC will stop her in her tracks. However, in a teamfight once Kat gets a reset it is extremely difficult to actually land CC on her thanks to her extreme mobility with her shunpo.
My proposal: Make Shunpo act as a dash instead of a blink.
Without reducing Kat's overall damage or mobility, this single act gives her much more counterplay. It prevents her from using her shunpo to outright dodge skillshots coming straight at her, and forces her to think a bit more when she engages on enemies. At the same time, a skilled Katarina will be able to make smart decisions in the blink of an eye mid-combat, creating a more gradual power to skill ratio for Kat players.