I can't believe that so many of you guys have cut Thoughtseize from your lists. Thoughtseize is one of the best disruption cards ever printed.
It tells you your opponents entire gameplan and robs them of there very best card for just one mana. A turn one thoughtseize means that you will usually know for the most part what your opponent will be casting each turn and how they will respond to your spells often before they do. Why would you ever cut it?

