Nerf Anivia already
I honestly despise late game champs that have a free laning phase so much. I feel like a reward such as Anivia's late game should be worked for having to go through a rough laning phase. There are champions like Anivia, Azir or Oriana that deal massive amounts of AoE damage in the late game and can put the entire teamfight on their back while having an extremely safe early game. Anivia has stupid survivability and stupid damage even with only tear on her inventory. Her passive makes it hard for every mid laner to even attempt to kill her because if you turn her to egg, you wont have cooldowns left to kill the egg before she revives. Not only that but if you dont touch the egg she revives with full health while you are most surely low due to the previous trade, and now you can do anything to Anivia because she is back at full and the one who has kill pressure now is her.
Seriously, a champion with such a strong late game should be punishable in lane without the need for constant ganks of your jungler. Giving a weak early champ the tools to survive is fine, but Anivia is close to unkillable. Kassadin has no damage at all early on and is very fragile and easy to kill before 6. Ryze doesnt do any threatening damage with tear on his kit unlike Anivia. Veigar is no real threat before lvl 6, and even then his combo is easy to dodge and he doesnt feel as opressive as Anivia. Viktor is trash before he has the E upgrade and even then he is not even close to Anivia lvl bullshit. Karthus is completely immobile and much easier to kill than Anivia.
As you can see, all of those examples of late game mages really are counterable, unlike Anivia who can basically sit safe in lane and farm without being in danger, or if shes good and feels like it she can win trades too with a Tear and Catalyst because Anivia's mana damage scaling has a higher ratio than Ryze's... KAPPA.