Cass rework was a failure.
I know you guys think there's potential here . . .
aside from the one or two games she's accidentally done well. I have seen her do nothing but perform poorly. I have accidentally in bold because she happened to be on the same team that was 20-3 against my team, and our top laner was 0/9 7 minutes in, and mid went afk, and the jungle gave up. So, I mean. You don't need to be good on any champion to mindlessly turret dive with 4 people and her poison kept me from tumbling as Vayne.
One of the biggest problems actually lies in the very changes they made. For starters, her W for all intents and purposes is a "win more ability." If you are losing this ability will do almost no good because they are already on top of you beating your team to death. But, if you're winning, it will often prove useful in zoning turrets/objectives. If you're already winning the poison will just make you win harder because # mobility.
On paper it sounds like a brutal ability, but in reality a limited skill shot ability that requires very precise range and them actually being on it + not dash over it + have X seconds to actually take effect for a decent range? Get real.
On top of that, she also lost ratios + damage to compensate.
Additional things she lost:
Sustain
magic pen
conditional movement speed.
These were all important for her. +15 mpen sounds silly, but it makes the difference in mid lane. She also additionally lost extra ap she would have had around the 20 minute mark. And the 30 minute mark. Now they're attempting to compensate that via giving Cass a 1100 gold advantage into rushing ap but at the same time sacrificing CD/mpen to do so? The trade off is damn near only 500 gold. If even that, so in reality all that does is give you an amplifying tome advantage over the enemy in power spiking. As crappy as it sounds, the original passive was better overall.
This current passive tries to achieve an early game snowball fantasy + a 6th item slot powerspike fantasy. The problem is. Games never really ever go to the 6th item dream build. In 80% of your games, this passive will do absolutely nothing for you.
It's all these tiny little things that in all honesty . . . made her a blatant failure of a champion. But, guess what, you gave her a potentially pick ban broken mechanic. So, she has to remain a pile of dog shit otherwise her winrate would skyrocket through the roof. So, now you're in a catch 22 situation and the only way out is Yorick . . . oh wait, he's a better champion than her now. ECKS. DEE.
GJ!