I think your problem here is you're trying to cover all defenses at once, and that won't work. With a deck like this you have to overpower your enemy so he can't exploit any weakness. So, with that in mind, I'd remove all the artifacts you currently have, increase to 22 land, remove most of the instant spells, and add the mana generating artifact creatures Silver Myr etc. and some Tempered Steel .

Hit hard and fast right from the beginning, and then get the golems out the push for the win.

And, remove Evolving Wilds and Transguild Promenade and look at the guildgates. Azorius Guildgate , Simic Guildgate and Selesnya Guildgate would be better for your mana distribution then those.

Lastly, if you add a couple of Fate Transfer s, you don't need to go with all five colours for your big creature.

DancesWithGoblins Thanks for the advice, it's welcome. :) I'm not that attached to the artifacts, most of them are currently used to get me the land I need out, but I'm sure with the guild gates I'll have whatever land I need. I do want to trade out Demystify for Sundering Growth . I want to add in some populate cards so I was thinking about putting in Growing Ranks and Druid's Deliverance , maybe Cloudshift so I can get more golem tokens out.

Any thoughts on removing Tangle Golem , Glass Golem , and Darksteel Sentinel s?

I already removed the Razor Golem s

Contemplate dropping Glass Golem and Darksteel Sentinel for a couple more Hover Barrier s. Your splicers are what buffs your golems up, if you let them get squished, your golems go down in usefulness.

I'd also drop Magnetic Flux for another Cloudshift , you only have one, and you'll see it so rarely and barely even use it, so make better use of the card space.

DancesWithGoblins I'll probably do that. Do you think I should keep all 24 land? or maybe lose a few?

To be honest, I think you'd do well with a couple of Myr to mana generate. Since all the Splicers are 4 CMC or higher you don't want to be waiting and waiting for land (Silver Myr , Copper Myr , Gold Myr )

DancesWithGoblins Do you think I should lose a few land to put some of those in there? How many?

I'd drop to 22 land, then start removing the less useful creatures, and put the Myr in their place.