Remember the random increase in AP-item prices?
When preseason started, and ADCs got a lot of cool stuff, all mage-items had their price increased by about 200 gold. I remember most of community were baffled with the change, even though Riot said it was "because of higher gold income". However, it HAS showed that mages in general were pretty shafted by the change. Let me explain:
Champions with
or
as CDR/mana sustain and
as damage core are - generally - doing pretty bad right now. I am talking about the following champions:

. Viktor and Ori are still in competitive play, but the others are barely or never seen. In soloqueue,the same is true with the champions rarely seen (only mains playing them), and still does below average. The champs who does really well with the listed core items are Lux and Ahri, and honestly, both champions were overbuffed in the past.
So if you want to succeed as AP-based, you pretty much need to use the buffed items
or
. This is for example what Twisted Fate does, and Annie/Malz/Morg/Liss/Anivia has used ROA in - well, ages.
It's time to revert the changes. The price increase caused the
madness, but now that was toned down. Don't wait 4 months to make

useful again, make their items cheaper and nerf Lux and Ahri accordingly.
are compensation-nerfed (what is the reason for these champions to be much stronger than other mages?)
The most expensive ap build.