Fine guide, tassadar is a fairly one dimensional hero like many in HotS at the moment I think that has one dominant talent for most tiers. I don't think there is much viable variation you can do on this build, the only exception being prescience & dimensional warp at lvl 13 & 16. Second storm and shrink ray are preferred but if your composition lacks sustain and they focus you a lot then prescience and dimensional warp together are great. You won't be able to land too much storms...