You can cut to about 36-37 lands easily. I would put some mana-rocks in their spot. Coalition Relic and Darksteel Ingot are the two that you really should put in. Coldsteel Heart and the others are up for debate.
Sleep doesn't seem like it will do much.
Thoughtweft Gambit , Thoughtbind , Spell Snare , Remove Soul , Lay Bare , Faerie Trickery , Deprive , and Cancel are all pretty bad. If you really want to be running counters (and you shouldn't be running this many if you do), stick with the aforementioned Arcane Denial , as well as Hinder , Spell Crumple , Cryptic Command and Glen Elendra Archmage .