Yes that sounds like a good idea - because those decks are very frustrating. Even when you can beat them, they often take much longer than they should because you have to wait for the dim shields to pass.
Also the good point was made earlier about the SoW making the immaterial creatures invincible. They cannot be targetted, pass shields - the only counter is healing or rush. THe dim shield easily prevent rush unless you have steal or deflag. Perhaps although untargetable for negative effects, the immaterial creatures could be still able to be labotomized by lobotomiser and mind flayer.