Why did Cass winrate spike up now?

Hmm. Looking over her win rate history, it's been a bit of a roller coaster all month. The december 30 winrate spike back up looks like it was partnered with a drastic decrease in pick rate on that day, though.

1.) Few people play her, those who do are people who play her really, really, really well (similiar to Heimerdinger has agood winrate in high elo, though he's underpowered)

2.) She got improved after being gutted, meaning many people (who didn't get the message) underestimate her

3.) People hat always trouble fighting her, I play her a lot - and statistically speaking - only 1 out of 15 enemies is start enough to start boots, making it MUCH more difficult to land skillshots

4.) Cassiopeia has great synergy with very specific other champions. While she is not commonly picked, picking these champions leads to great teamfight performance (+ . If you're funny try Cassiopeia + Maokai + Karthus + Leona). (It's more a Maokai than Cassiopeia thign though)

5.) She is a horrible firstpick, but a great lastpick since there are certain champions which she counters extremely well (twisted fate, Annie)

6.) Many people don't understand her powercurve. She has a horrible level 1, an insane level 2, then falls off extremely again - just to hit a huge powerspike at 6 (ONLY if your opponent allows himself to get baited into his stun) and then off again... Pretty much until she gets 500 stacks - then she suddenly starts hitting like a truck from one second to next...

Let's just say - fighting her is confusing (if you don't know her well). If you know her well you dominate her without too much effort, but since she hasn't seen much play sicne 2 years only few people remember her at all.

Thus Cassiopeia has a low pick - but a high banrate rises. Due to the nature of the current situation her winrate will drop extremely once she sees more play and above conditions are not met anymore.

EDIT:

Gameplay commentary: In lategame teamfight a lot of people (especially ADCs) make a severe mistake: They Flash AFTER they were poisoned instead of flashing THE poison. Flashing her poison means her DPS drops to nothing for the next 3 seconds. Flashing after you are poisoned just means that she has to chase/counterflash.

People stopped crying and actually played her.

Cause all the buffs she recived after rework made her into a true hyoercarry, her early isn't as shitty as you can max Q and still deal decent damage with E as it now has the full ap-ratio at ranl 1, her speedbuff+slow combi are quite strong for kiteing/chaseing, and it'S not that hard to get your stacks together anymore. She can actually be a massive bully vs melees toplane, and once she reaches lategame with full stacks and 3+ items, she starts to even outscale ryze.

That beeing said, she still isn't a good rework, and also not really a great designed champ. Her powercurve is to extreme with massive breakingpoints, and she simply doesn't deliver the cntroll and poison mage feeling she gave pre-rework, more like a over tuned ryze(in the late), spamming spells till everything in range is dead.

They threw a shitload of buffs at her to try to get people to shut up about literally the worst designed rework they've ever done. Everything about this rework is fucking awful and stashu is a moron who shouldn't have a job. But hey, slap number buffs on shittily designed kits and then point to win rates as if they mean a damn thing, then let your sycophants do the rest. Riot is a joke.

Expect her to get nerfed soon to an even worse state than immediately post rework.

I like cass....

Not crying about balance, crying about how she isn't the same champ.