S Tier:
Top of the line Mages who will do well in the new update.
Veigar is pretty simple. He just got straight up buffed and got an ultimate that doesn't rely on Champion Select. Scary.
Malzahar is incredibly powerful on the PBE, mainly due to his Jungle build. His extremely early capability of soloing epic monsters changes the game extremely, especially with epic monsters becoming more important in general.
Annie got tons of changes and, I must say, what was hated about her was nerfed. However, she then got buffed in other places, especially with her E. She is now like Malzahar where she can effectively counter Assassins and still be a Mage. Very powerful.
Galio got an indirect buff in tons of places. More Mages = More MR = Better Galio. AP Gapcloser item that makes his ultimate better. Galio got direct buffs as well. Galio is looking really good.
A Tier:
The next line of Mages from S Tier. Good because they got buffed from last patch, most of the time from an already decent status. They might also be here because they counter some S Tier Mages. The S Tier might also be where they are because they counter these Mages.
Vladimir is another great anti-assassin. He is a huge counter to Zed in Middle Lane (hint: Pool before Zed appears from ultimate), and has amazing sustain now.
Cassiopeia is yet another anti-assassin. Tons of assassins are going to wanna play next patch with Mages running about, and that is just what Cass wants. The anti-mobility Mage likes this.
Ziggs got a new niche in this patch, somewhat, and that niche is amazing. His W has become a pushing machine and he counters the buffs to towers this patch.
Zyra got buffed, even if by a little, and that lands her here. Simple as that. Ok then, strong now.
Brand is now the wombo combo Mage. His Passive can proc his passive, so that makes him incredibly good at chaining kills, making him a power house once his ultimate is up especially.
Swain used to have a problem to where, if he couldn't see you, you were safe. No longer the case. Swain's Q is now a skill shot and zoning tool AND wave clear. Plus, his E damage amp was buffed to be 20% at all ranks, which was the main reason for maxing it, meaning Swain got a huge buff in general. Plus new RoA synergizes with Swain a lot. A fed Swain can 100% end a game now.
Vel'Koz got a decent buff to his ultimate, but nerfs to the rest of his kit. What makes him A Tier then? His ultimate. It's that good now.
Karma and here is why. Athene's still works for Karma, because of her shield, and that's all she needs. She got buffed from this item rework and she was already decent in the game right now.
B Tier:

C Tier:
