Kalista and her Passive
The idea for Kalista is nice, believe me I appreciate the style/theme she has. However I think she has the strongest passive in the game versus melee champions. And I think with no resource cost for her mobility, and always has it from level 1 onward, it is just unhealthy for the game.
An option is to change her passive so that it is an active ability, like Kog'Maw and his W ability that gives increased basic attack range and other steroids for a window of time. Her W obviously would be the go-to choice for the new spell. Removing the vision spell from her kit wouldn't even be that big of a nerf. Can even transfer the passive from her W to the passive slot in order to compensate for the removal of her mobility as a passive.
All she would lose is 1) her vision buddy and 2) her ability to 100% of the time have heightened mobility with zero resource cost whatsoever. Even YASUO has a limitation, being able to dash only once per target every few seconds. And it's still questionable how OP that mobility is.
Also keeping the ability to dash with her Q, even when W not being active, would be cool as well.
Please give more counter play! :)