Kai'sa nerfs when?
The only way I imagine this champion's development is some high on drugs dev at Riot HQ thinking about how to make Vayne and Kog'Maw meta again so he decides to fuse both into one champion whose only weakness is lack of range.
Lets be serious, Kaisa is an autoattack based champion that blows up squishies with a Q, why can she build like an on hit adc and deal ability dmg like a Lucian or lethality Miss Fortune?
She not only destroys squishies but also mows down tanks in a couple seconds and the best part is you cant build to tank her since she deals hybrid damage, and not only that but she also deals % dmg on missing health that also scales with AP and guess what, she can build items like Zhonia which is the perfect defensive tool for an ADC while profiting from all the stats it gives, and not only that, but her on hit build is not limited to attack speed, its usually paired with items like rabadon or zhonia.
I would like to build Zhonia on my other adc's too but guess what, I cant since i would be wasting an item slot just for a stasis effect to save my ass.
Kaisa's itemization is too optimal and versatile, she can build too many items that other adcs cant while not wasting any of the potential of said item.
E+ Stacked Rageblade+ Nashors Tooth+ Greaves already gives her the attack speed cap and if it doesnt it should be pretty close, thats only 3 items which sinergize perfectly with her. she still has 3 items left to build whatever she wants whether its survivability, even more dmg, crits, more AP, whatever, everything works.
Lets look at other adcs, crit adcs usually need Stormrazor, Rapidfire Cannon, Greaves, Infinity Edge and Last Whisper to effectively take down a tank. Thats 5 items while Kaisa can perfectly do that job with 3 items. Even other on hit adcs like Varus or KogMaw cant even compare to her, Varus doesnt have any kind of mobility and needs to hit extra abilities to effectively make use of his % dmg, note that Kaisa only needs to auto, and KogMaw just doesnt stand up to the meta in general, he is even less mobile than Varus and much easier to focus.
All in all, Kaisa has the upper hand on all crit adcs itemwise since she does the same job with 2 items less, shes a late game adc thats not as bad at the early game as other similar adcs are, she is supposed to be an autoattack based adc but still has 2 hard ability nukes (Q and W), her ult gives her a massive shield that SCALES BOTH WITH AP AND AD. Lets be honest, new and reworked champions feel like a brand new $5000 worth gaming PC compared to a toaster laptop.
out scales her damage easily... so does 
on other ADC's.
