Kalista Changes I Think Could Work
So I would like to start by saying her passive or her infinite stacking E have to go for her to be balanced. I personally think the infinite stacking E should go.
Passive: only change here is the removal of the 90% aa damage.
Q: Stay the same
W: remove all the buffs for being near oathsworn. Only oathsworn component kept a is the percent health damage when you bot attack the same unit.
E: I don't have the numbers, but Kalista now tosses out up to 5 spears that will stay on the enemy. They still reset every time a unit is killed and now if an enemy champion has 3 or more spears in them it resets. The slow would probably need a nerf. The damage would also need some adjustments.
R: stays the same.