Has 1.5/4 abilities
More like 3.5 of 4. Q and R are great. W is important. E is meh.
Garbage rework, Garbage champion
The rework was fine overall. But all they did was turn a lane bully into a lane bully. It was a pointless rework that killed her identity as a poison mage. As a champion currently, she's fine. But it as 100% a waste of time.
Q scaling gutted and E turned into physical damage
I didn't know her too much as a mid lanner. Can't really comment.
Reworked into a boring tanky AP bruiser
He was always intended as an AP bruiser. He was never meant to be a full AP that two shots carries.
Shit damage, Shit mobility
Mobility got buffed. Damage got nerfed. If you can think of a way to balance him without killing off his damage go for it. Spread your thoughts. But in no way should he go back to who he was.
Reworked into an AD Assassin
Still an AD carry. Assassins get in the fight, take out their target, and get out. He just keeps beating on you.
His AP playstyle was really really stupid. Like using Katarina but you can't CC him.
AP Scalings reduced
Justified. One of the tankiest champions in the game that EASILY will top the damage charts.
Q & R ratio reduced, meh pick (Patch 3.14; Support changes ))
Wasn't that reduced because supports got gold generation? Honestly doesn't really count.
Not really a mid champ.
E lost 0.4 total AP ratio
Came with a big buff to mana cost and CD. It was a buff.
He was known for his mid plays? Sure he can go there, but he's was never a mid meta champ.
Reworked into an anti-fun assassin, garbage in mid lane
She's Anti-Fun everywhere. Please don't tell me you think Q spamming all game to deal 90% of a champions health is OK. And it's not like you cannot build her that way. It's still hurts.
AP scalings almost HALVED (Patch 3.14; Support changes ))
Same as Nami. Those scalings assumed you were getting little to no AP.
Although she did have some time as a mid champ. It was short, really really toxic and shouldn't be on this list.. Like facing her in ARAM right now. So much safety and waveclear that there is no countering it. When the support changes started, people took her into mid lane on the PBE with a massive shield and damage.
Her W also rooted at 1k AP because it would turn into a 100% slow.
Reworked into an AD tank
Please don't tell me you thought his kit was fine before....
Garbage base damage, Garbage AP scalings [E gains 1% movement speed per lvl, LOLOLOLOL] (Patch 3.14; Support changes ))
E's power is based on her R. I'd rather see her E gain more per rank and less from R. But I can understand it. Her kit as a whole needs to be rethought up. Make her aura her passive instead. Since they can't seem to balance it without making her a pain to play anywhere but ARMA.
Like Janna. Saw some mid time, but really shouldn't be on the list.
Reworked into an even more annoying support, garbage in mid lane
Another short time mid meta support with horribly toxic gameplay in that roll. Shouldn't be on this list.
AP Scalings changed into armor scalings, totally garbage in mid lane (Patch 3.14; Support changes ))
Sigh Another support. Getting a rework also.
His only source of damage turned into a clunky easily dodgeable skillshot, garbage in mid lane, but good as a support.
This one I can agree on. He did need the change. But I don't find him enjoyable to play at all.
There you go, 16 AP mid picks were destroyed from Season 3 till now. Yeah, I know some champions like Master Yi can still be played in Mid and do great, that's why I specified "AP Mid laners".
Overall you mostly listed champions that were being played out of their roll(tank, adc, support, bruiser) when they built AP and were out preforming champions who could only build AP.
Honorable mentions:
I don't even know....
Neither does Riot on that one... gets changed every season.
Assassin S3
Tank S4
I think he was a bruiser for a while.
Back to assassin now?
Also... when was he AP?