Kata nerfs are going in a wrong direction
Katarina Base HP reduced to 510 from 560 HP growth per level increased to 83 from 80 Base HP regen per second reduced to .9 from 1.5748
Its a nice nerf to her earlygame, since its very safe. But she can still outload her full, unavoidable dmg on you from her q w and e.
If a mage or adc gets into 700 range of her, she can just shampoo on them, aswell surely hit her q and w for around 500 dmg without counterplay. After that she can just ult + ignite for an easy kill.
Instead of nerfing her basesstats, do something about kit.