UW Control 1.3

this deck is very similar to chapin nassif decks at the pt. i have moved the flashfreeze celestial purge to sb, cut two counterspells for more removal since the meta is so fast the threats are usually on the board before you can counter, and cut the arid mesa scalding tarn for sejiri refuge since they dont mesh well with treasure hunt and id rather be gaining life instead of paying it. im not sure if id be better off just adding plains and islands for the mesa tarn to keep down my cipt land count, but for now im making sure that i always have the uu for jace. i only have one baneslayer, and probably wont be able to get more anytime soon, but otherwise have everything i need for the deck. comments, especially about what to replace the mesa tarn with would be helpful. also, the sideboard is kind of haphazard if there are any suggestions for improvement that dont involve adding multiple baneslayers.