This started off as a Robot Vehicles deck that just didn't have enough legs to stand on. So I thought that you could stay "colorless" but should swap in some devoid creatures and spells. Personally I think that Foundry Inspector is a bad card with only 2 toughness. I played a devoid focused deck about a year ago and Herald of Kozilek was good most of the time, but that was because of his 4 toughness. Herald also will make both your artifacts and eldrazi cheaper at the same CMC. Adding red and blue to your mana pool complicates your land base up a bit but I believe that I solved the "3 color" issue. I feel that my deck curves well and that playing Skysovereign, Consul Flagship on turn 4 feels great every time you pull it off.

There are a few things that you need to watch out for when playing this deck.

Kalitas - He hoses your early trades by exiling them. It's kind of a big issue so bring in removal against him.

Ceremonious Rejection sucks and there isn't much you can do about it. I expect 2 in every blue sideboard so know that it's out there.

Revolutionary Rebuff aka Mana Drip - it really isn't an issue since we are lowering our CMC with Herald but it's still a good idea to take the draw go method until you can drop multiple things each turn.

Some general comments on card choices. Tide Drifter - In my previous experiences, Tide Drifter does some work. Against aggro he stalls the board and against burn he puts your other creatures outside of burn range. Since we're mostly playing cards CMC 3, he helps us live to cast those cards.

Matter Reshaper - I already commented on how we're playing a lot of 3 drops, The truth is that only 6-8 cards, depending on your flex spot, cost more than 3, meaning that he has about a 90% chance that he'll put your top card into play.

Prophetic Prism - Turn 2 cycle that sticks around to help fix our mana. With a Herald it becomes a cantrip. It's considered colored mana source 13-16.

Vile Aggregate - An x/5 trampler that gets bigger from all of your other creatures feels good and will require immediate attention from your opponent or else he'll run away with the game. He also benefits from your half lords and from you crewing your vehicles, giving him a little extra oomph.

Mirrorpool - Trying this out as a two of. Copying a Vile Aggregate, Matter Reshaper, or Thought-Knot Seer doesn't seem like a bad idea on a stalled board state.

Aether Hub - Acts as colored mana source 9-12 for a single use and provides colorless mana for when you need it. I would have prefered a Pain Land but this will have to do.

Sideboard/Maybeboard

Kozilek's Return - It's an instant speed Pyroclasm with Herald

Mist Intruder - I expect to see spirits out in the coming weeks and that means flyers. Gives us a blocker in the air. Up for suggestions on other options.

Spatial Contortion - I expect to see a lot of Smuggler's Copter for the next 18 months, and this is a two, sometimes one CMC answer. It also helps push our Vile Aggregate and Skysovereign over the top with 3 extra damage. I feel like this is going to be main boarded most of the time.

Molten Nursery - It's our version of Thermo-Alchemist that's an enchantment. Great for control match ups. I played this a year ago and it felt good to play when your opponent wasn't playing GW and casting Dromoka's Command. With that card rotating out, this seems like a good play.

Reality Smasher - Felt a bit too high on the curve but is otherwise a great card.

Welding Sparks - The worst thing about it is that it cost 3 all the time. Other than that it's great. Guaranteed 3 damage, usually more.

Spell Shrivel - Good to play against Blue and Black control. I've cast it for one and it felt dirty.