Is This a Good Sivir Build?

I apologize if this is in the wrong section For all I know, Lolking has a forum tucked away somewhere. Anywho, here's the attached build. I picked Mercurial and GA to protect myself from Teemo, Jinx and Morgana and it only seemed to help a little bit. Morgana still 1v1ed me in a bush even with GA off cooldown. - I don't even know how that happened, but that's a gameplay problem and my question is purely item-related.
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