sea gate wreckage? seems pretty good

Etherium sculptor isn't needed, so those could go out for memnites.  also 4 steel overseer and 4 etched champion may be too many.  master of etherium is a pretty good option, and frogmite is still a decent possibility.  i would also suggest going up to 4 springleaf drums until you get mox opals and even then a 3-3 split might be best.

Why are you running swamps?  If anything, those should be islands, since you need blue mana for Thoughtcast.  Some Blinkmoth Nexus should probably be in the list as well.

Also, you should probably either go with the mono red plan or not run red.  Playing Tempered Steel in the same deck with the red cards is not the best idea.  If you need removal go with Dispatch.

It seems to me that a lot of the lists lately are dropping the white cards and going with Thoughtcast and Galvanic Blast as their colored spells.

From the way your list is right now, maybe cut 4 Tempered Steel, 2 Dispatch, 2 Frogmite.  Add 4 Ravager, 1 Steel Overseer, 3 Galvanic Blast.

Then change your basics to 4 Blinkmoth Nexus, 3 Inkmoth Nexus, 1 Island.  That's probably how I would build it anyway.

Ran a few tests on cockatrice and Plating was the most important card.  You might even consider running a couple copies of Steelshaper's Gift to find it if you stick with the Tempered Steel version.

if you are going the affinity route, you want it to mainly be red/white. You also want shrapnel blast.