Diana may need to be looked at
Lately I've been seeing an awful amount of this vitamin D deficiency having twat, and it's for unfortunately a good reason. She's very strong at the moment.
In her current state Diana has some of the best burst damage in the game really but what's scary is that unlike a Talon or a Zed where you spit your load on one person then you're kinda done she can sustain this crazy burst throughout a fight, with proper management of her resets and such. This doesn't seem to terrible because other champions like this already exist like Katarina.
The issue is coming from Diana's W. I believe that the shielding that's being provided is just a bit too strong at the current moment because she's just really un killable it seems in her current state. She has the ability to tower dive you at full health at level 7 with only one or two items, has the damage to kill you quickly and then the tankiness to get out alive rather easily.
Alas, these are just my thoughts. I hear that she's also a menace in URF