Hi,
I think that this deck ist viable, because it's fast and constand. I built it and played it on a regional tournament
and I won it, so that's anather reason for me, that I thik it's aviable. Or it was luck

My oppinion of the Sideboard:

3x Spell Snare
3x Null Rod
3x Defense Grid
3x Energy Flux
3x Darkblas