User blog comment:Care Level/Let's talk about Diana./@comment-24063440-20140309215338/@comment-8506165-20140309233132

"low AP"? RoA = 80AP, Rylai's = 80AP, Hourglass = 120AP, LB = 80AP, Hat = 120 AP

Added together this makes 480AP, multiplied by 130% for Hat passive = 624 AP.

This isn't "low". The lack of magic pen, yes, is a problem, but AP is definitely not lacking in that build.