Why are AP champions getting massively nerfed in S6?

**Masteries** - Losing 5% CDR in offense tree - Losing 5% bonus AP **Items** - AP items cost increased across the board - Zhonya's stats reduced - Banshee's and Spirit Visage have significantly increased MR and more HP - Many AD items buffed, a few of which grant massive survivability increases to AD champions. So...whats going on here?
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