AP Items all significantly nerfed?

Currently looking at it, marksmen spike harder and faster than mages and also have a better late game, I just want someone to tell me why I should play a mage over a marksmen mid now? What will be the current role for a mage now in Season 6?? You want waveclear go ahead and do runaans or shiv or most ADs Someone to start the fight, grab sivir and go full blast I don't know if Caitlyn is enough to say she can do Zone control
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