Artifact lands are there for synergy with Metalworker, Tolarian Academy, Tinker, and Goblin Welder, as well as Sundering Titan, so I'd be really hesitant to remove them without good reason.
Here's a good reason.
With a Null Rod in play, the only things that actually will produce mana in your deck are Mishra's Workshop and Tolarian Academy.
Replace the Artifact lands with non-Artifact lands.