Why are you nerfing Kalista AGAIN?

Kalista is already in a very good spot right now, and is statistically one of the better Vayne and Ezreal counters. Why are you removing the mana refund on killing one target with Rend? You already have nerfed her a lot previously and I think that Kalista is currently undeserving of a nerf after the very recent nerf to her W Passive. She's more susceptible to targeted cc than most other ADCs, due to her not having self peel and being very easy to burst down, except that with her ult which is dependent on her support or jungler, and a 25% slow on her E. If you are going to change her mana refund, maybe change killing 1 target with rend to 10 mana, and scale up to 20 for every additional target, it'll make it more forgiving of accidents with Kalista while rewarding more experienced and good players. Live values for mana refund are 20 for one target, and 40 for two or more targets. Current PBE Values are just the cooldown reset for one target and 40 for 2 or more targets. Thoughts?

Oh yeah, buff Twitch by adding a reset on Expunge on minion kills (can't say Contaminate >.<) TL;DR Kalista is fine where she is, don't touch her, and buff Twitch. Edit: Why are so many people downvoting this QQ >.<