-2 Gold-Forged Sentinel
+4 Ornithopters
+2 Negate + 2 Disdainful Stroke in the sideboard.
Other good addition to the deck would be the Ghostfire Blade cause it can make some of your draws extremely explosive and hard to deal with for the opponent.
Also your deck will have problems in fast matchups because most of your threats are really mana consuming, so a good option would be to try and make it a little bit faster so that it can keep up. That also gives you more chance in the control matchups, when you're kinda trying to go under and overwhelm them before they can stabilize themselves.
Here's a list I came up with for the artifact theme in Standard.
Unfortunately it's hard to stay artifact based in the current meta, because there is no card that can take this deck over the top, like Siege Rhino or Dragonlord Ojutai.
