What small change to a champ could increase their winrate but not make them perma ban?

I thought of a few small changes that do that.

Nami speedboost from passive ignores the soft speed cap for just her speed boost.

Getting a kill with Draven ult will add 30 adoration stacks to his cash in on kill(so if he had 40 stacks then killed someone with ult he will get a reward equal to 70 adoration stacks).

Karthus ultimate does more damage to lower health targets.

Ashe R is chargeable.