The 1 Shattering Spree seems a bit random without search but I guess it's there to draw it occasionaly in the Shop match-up.
I had 1 slot open. It could have been anything. Spree is a decent card at most points in the game. Early on it could kill a mox or 2 and late game it could devastate an opponent's board. That slot is super open.
Why Duress over Thoughtseize? Was the damage too much together with Bob?
Yes.
How has stifle been? It always seemed less useful to me in URBana than in other Fish decks. Of course it adds nice to the mana-denial of Rod, Shaman and Wastes and it's nice against combo but I wonder some extra hard counters (Mana Leak and such) would be better for stuff like Will and Tinker.
I barely drew stifle all day. It's more useful in other versions of fish, but its good in here too. It was another way to deal with storm.
I must test out Welders in the side. I would say Heretics if 8-Spheres are bothering you but Welder could be very good indeed.
Heretics seem like an ok idea. I'd love to hear how they work out if you try them.