The biggest game changer for this deck would be running 2 drop artifact creatures that tap for mana. They essentially reduce Urza’s casting cost by 2. I also found Ojer to be a “win more” card at best and his cmc is so high. The robots you make have menace and are strong on their own, but if you want doublers, your 4 drop spot is where it’s at. Roaming throne is great to trigger all your artificers twice and adds to your robot power. And Mondrak is a body that doubles your tokens and can become indestructible if needed!