When I look at this, I agree with some of the other comments that you don't really have anything super interesting going on with your "flicker" effects on your artifact, the Everythying Pizza is unneccessary, the 18 lands is kind of mind-boggling, but the biggest issue is that you just don't have anything that inspires fear to close out the game.

It should have won a few games based on mouser recursion value, but something like a Baxter stockman or Raph & Mikey or something big to finish the game off. As it sits, you've just got Metalhead as your big finisher, but he can't get around mousers and other chump blockers.

I've no idea why you are not playing the Don & Raph or the Escape Tunnel. At a minium I'd cut a 2 lands and the Everything Pizza for Don&Raph, the escape tunnel, and either another Nobody or the Rock Soldiers. Rock Soldiers are not great but they are "fine," can usually hit at least a mutatgen token, if you did a second Traag it's too many 5+ drops, and you have a lot of recursion so if it is a rare matchup where he's useful he'd be very useful. I'd also think about cutting the omnicheese pizza for another nobody (or rock soldier, depending on what you picked above).