Analyzation and summery of the ap itemization rework so far

Summery at the top of the OP, TLDR at the bottom

Overall all AP items are nerfed in order to compensate their added/changed passives and stats, usually resulting in net nerfs with fancy passives that people think outweigh the nerf, nothing surprising, Riot doesn't like AP champions at all and wants a clean and simple 4 man ad with one tank like Malphite on each team to make balancing easier. Across all boards you get less AP on lots of items so now getting 700 AP would require full builds without boots.

Items: Catalyst is mega nerfed, people seem excited about gaining back HP for mana spending but you need to spend 166.6 mana a spell to get back 25 HP, a health bead can provide more sustain than it even with Karthus because he will go oom before he gets anything back from it. The mana refund for your damage taken doesn't help because for every 1,000 damage you take, you get back 150 mana, not too big of a bargain when you get no hp back from the other part of the passive.To put things into perspective, if Karthus wants to regain 600 HP, he will have to press Q 100 times or pay 4,400 mana. Catalyst lost its level up passive that gives more mana and hp than it's new passive.

ROA mega nerfed again, no more point in buying this item at all since now it gives no mana anymore either to compensate its awful passive.

Tear of Goddess has been given a sweet buff of giving all your spells a 25% cost reduction, it is very sexy

Chalice line gives a lot more mana regen since most mages have more mana than hp in the first place, but Athenes has been nerfed again such that both chalice items are support items.

Morellonomicon has been given a better build path (Netherstrider Grimoire where?!?) at the cost of having no more regen but it gains 400 mana, regen is pretty important though.

No more spell vamp on hextech revolver, Vladimir mains are practicing hemomancy right now.

Orange Pumpkin is basically a mini Kassadin ultimate and I believe it still has more range than his ultimate, it is a dash so it can be stoppy by poppy and it doesn't go over walls. I would say it would help Annie out a lot but she is getting reworked soonish so we don't know how it will interact with her kit.

Blue Pumpkin has stats better than ROA will give when it is fully stacked other than ROA giving you 100 more HP and 20 more AP, but the active is better so don't bother building ROA over Blue Pumpkin

Zhonyas Glass gives even less AP but has cdr, not really a good trade off because there are less and less ap options and that had a big chunk of AP and it costs 3k ap for 70 ap :/

Abyssal Sceptre is for bad boys who need to punished, it has a worse aura early but it scales so it's good as it goes 5 mr shred higher when you are at 18 and now it gives cdr

Spirit Visage gets a well needed mr nerf but it gets 5% more healing and extra base regen, MUCK FUNDO

Banshees Veil gives less HP but has the same amount of 70 MR

TL:DR: AP Itemization is nerfed further because they get worse but fancy passives except Tear of Goddess and Abyssal Sceptre, SV and Banshees get lightly nerfed. Every item other than Abyssal and Tear is being nerfed.