Cassiopeia needs a rework that doesn't make playing her give you carpal tunnel because you have to rapidly mash the E key on your keyboard.
Seriously, she's a poison mage turned AP Marksman. She was only played after the rework because she was overtuned and could shred tanks faster than regular ADCs could. Now she got nerfed to the ground and doesn't actually do anything unless she gets an easy mid-lane.
And don't get me started on how she doesn't actually get to deal any real damage until she finishes her passive mini-game: Land Q and W for 25 minutes to get your Rabadon's passive and finally scale up to your old damage.
The re-work is pathetic, unoriginal, and trying to tune the current iteration of Cassiopeia is pointless.