I would definitely drop the 2x arrivals in favor of another stormstress and 2x'ing one of your other cards. Starts to address your singleton issue, and stormstress helps with ward.

I honestly, I think I'd skip guild enforcer in this deck. The idea is to stall until 9 mana, and Labyrinth Guard is amazing at that. In control mirrors many opponents will even blow things like Ratify on them.

Otherwise, I like the deck. One thing I've started seeing is people running the Thaumaturge echo guys again that deal 1 dmg on death. They combo it with Tracking Bolt. Haven't played control magic in ages, but I might try it out.