Season 6 Kassadin

Alright so I need some help form the League community with my man Kassadin. Since hes been nerfed sooo much whats the best stuff to build on him anymore and what masteries should u be running on him?? Hes lost so much potential since the season 3 season 4 range. Just need some thoughts on our guy Kassadin from the community and Riot lets make him classy again with the ult Range pls.
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