ap is much harder to get now...
every single ap item was nerfed aside from 
. if i dont build a 
i find myself around 450 ap which is about 70 or so less than before.
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And you likely have at least 10% more CDR then before, in addition to a more powerful blue buff. And I don't know about you, but for most of the mages I played, I typically didn't buy Rabadon's until a last item