Replace DFG
The main issue riot had with DFG was the active was like a additional nuke for mages that added a 20% magic damage increase.
DFG as a item has a specific niche. It is there for Champs who need CDR and AP. I think that DFG should have not been removed and the active should have just been changed. Why can't they bring back DFG with 120 ap, 20% CDR, and a new active that either slows or does a mini exhaust like devourer.
is quite effective. Basically you are paying 40ap for an additional 10%cdr.