My Sharuum deck started off very similar. I've found that Grand Architect helps with getting artifacts out quicker, and Riddlesmith helps with getting artifacts to your graveyard. Pentavus helps with making 1/1 flyers to keep non-trample damage at bay. Shimmer Myr and/or Vedalken Orrery allows you to take much more advantage of the Unwinding Clock. Nothing like flashing Scourglass during your Upkeep to wipe the board.Tezzeret, the Seeker allows you to use multiple mana rocks in the same turn as well as get that 4 or less CMC artifact out when needed. Skullclamp gives you massive card draw off your Myr/Pentavite tokens. I like to use flicker defensively to keep my creatures alive. Cards like Cloudshift, Ghostly Flicker, and Momentary Blink work wonderfully with Sharuum