It is a build that has worked form me, Kerrigan is my fave and I've tried a lot of combinations, this one I fancy the most, she can heal herself early game by doing damage, she damages foes after ability use with zerglings and primal grasp and later game she gains shields like crazy, the strategy here is to get into team fights last and just throw the whole arsenal, this way you can wipe out the opposite team, you can one-on-one kill pretty much anyone (well 75% perhaps)

Note:
if you rather do more damage then level 1 must be Sharpened Blades; that'll be all