I think this is the main issue here. Not the fact that TSphere and Crucible are doing what they were meant to, but the fact that they can be consisitently accelerated out turn one with only one other card, the workshop. Granted replacements exist in the form of Ancient tomb etc, however i think this route is more acceptable in that it alone doesn't power out a TS or Crucible but needs an additonal accelerant. The reality would probably be that turn 2 Sphere's and Crucibles would then become the norm, but its this additional turn that is required in my opinion. Sans Wizards errataring cards to say "cannot be played till turn 2" restricting MWS would seem to be the only way to generate this additional turn.