Thanks for the update :) I am very much looking forward to the immobile mage changes. In my opinion these are several mages that need to be looked at:
and possibly
.
Brand is a good example of an immobiole mage: he has power, combos, Teamfight, and CC. The reason i think he needs to be looked at though is because of his combos, i feel like they could be explored a bit more so their is more choice and less spamming. This is something ive thought about for awhile.
Anivia has a really interesting playstyle pre-6 in my opinion, hit them with Q+E for Damage, gotta use Q effectively its her only hard CC, the Wall is an awesome ability with a lot of potential. Then she hits 6 and her playstyle becomes a little more binary as her ult becomes the focus of everything she does. Im not saying this is bad or she becomes boring but i wish her ult augmented her playstyle rather than become her playstyle. I don't play her often though so my opinion on the matter is probably not reliable.
Malzahar is a very unique mage, i'd say he only needs help staying unique and powerful. His point-click Suppress is a lot of the reason people don't want him strong and i understand that, but they only need to try playing him against a competent opponent who knows how to deal with his kit to see that Malz isnt as strong as people think. Plus he is becoming more and more of a niche pick, only viable against certain champions, although currently a lot of those champs are meta right now.
Annie is toxic. Ridiculously strong, with an instant AoE nuke stun. Her kit is too easy and too strong, it doesn't take much time to learn how to stack your passive without alerting your enemy which eliminates counterplay. She needs to be toned down, her passive needs to be reworked or at least its interaction with her Ult.
Ziggs, he seems pretty feast or famine, he is either stomping or feeding it seems. I don't play him nor see him all that often but when i do thats the feeling i get.
Sorry for the long comment, I just like talking about things that interest me, the Immobiole Mages interest me.
EDIT: There is a bit of misunderstanding on what i meant in my comment. I am only speaking from my personal experience, so the champs i've mentioned and the issues i have are personal. If i didn't mention a champ its because i don't have any experience with them and don't know anything about their place in the game and whether they need work or not. I am also not talking about whether they are too strong or too weak, except Annie who i think is too strong, these are more issues i have with their gameplay or their core identities. Hopefully that clears up a lot of the misunderstandings.