Kalista mini-rework
As we all know, Kali is a champion who will probably never be near to good for average players due to two reasons: first and foremost reason being that because if she is good for average players she completely dominates pro scene and second, because she can be complete cancer to play again. So a potential rework should be focusing on fixing those two things and giving her power in other areas.
(P) Martial Poise Works on a charge system. Kalista can hold up to 3/4/5 charges based on level, and dashing expends one charge. If Kalista dashes towards an enemy she's attacking, her AA deals small amount of bonus damage and refunds a charge. NEW (optional): Kalista's critical strikes have special properties: they deal 20% less damage, pierce through her primary target and add two stacks of Rend.
These changes aim at making Kalista not impossible to pin down without absurd amounts of mobility and/or CC, but allow her to remain the unescapable spirit of vengeance she was meant to be. Added changes to her criticals should provide a twist from a standard ADC and move a bulk of her damage to a stacked up Rend. This might prove hard to balance and isn't essential for the rework so it could be srcapped.
(Q) Pierce About the same as now, except dashing with Q does not consume a charge.
Not much to see here. I feel that ability not consuming a dash charge is validated by Q having a cost and a cooldown so she can use it as a crutch when escaping.
(W) Sentinel Attack speed bonus when near Oathsworn removed and added back to her base stats. Sentinel duration changed to 3/4/5/6/7 laps from 7 laps at all levels. Recharge time down to 80/75/60/55/50.
This is where Kalista should've been nerfed a long time ago. Pros value vision from Sentinel much more than average Joes, and thus this aspect of her is severely weakened until she puts some points into the ability. And with all the other changes stupid AS gating on this skill can be removed and added to her natural stats.
(E) Rend Gets a full mana refund for killing one unit. Spears can now stack even while Rend is on cooldown.
Basically changes that were recently pulled from PBE. A minor buff to Rend's reliability both in farming and skirmishing. Objective control this skill provides is fair IMO as it is completely defensive in use - someone like Nunu or Cho can use their abilities to steal an objective with ease, while Kalista's is only useful in securing objectives her team has started first, thus justifying its reliability.
(R) Fate's Call Unchanged. There is not much that can be done about this ability without breaking or replacing it.