UW Control 1.31

this deck is very similar to chapins and nassifs decks at the pro tour. i have moved the flashfreeze and celestial purge to side board, 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 the land thinning doesnt mesh well with treasure hunt and the refuge really cements an already strong manabase. im not sure if id be better off just adding plains and islands for the mesas and tarn to keep down my cmes into play tapped land count, but for now im making sure that i always have the two blue mana for jace, which is occaisonally a problem. 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 mesas and tarn with would be helpful.