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Mox Opal: A Voltaic Key target if you RNG into only uncolored lands but want to drop a Winding Constrictor. Potentially gives an early mana advantage, and essentially is the deck's 23rd land.
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Inventors' Fair: Gives a highly deck-relevant library search and is also a land.
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Buried Ruin: People are going to destroy your artifacts, and this will help out with that. It will also cushion collateral damage caused by Ratchet Bomb and make fighting mill/discard decks less god awful.
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Academy Ruins: Buried Ruins but it doesn't help as much against library-destruction mill decks and doesn't destroy itself in the process.
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Spire of Industry: Chromatic land prevalence is needed to use the brokenness that is Winding Constrictor and Ensoul Artifact.
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Glimmervoid: See above.
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Mirrodin's Core: See above, but it also generates much-needed charge counters for Power Conduit.
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Darksteel Citadel: Ensoul Artifact and Prototype Portal target. Counts towards being able to use Mox Opal early for mana advantage.
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Everflowing Chalice: Put charge counters on it and pretend you were secretly a Tron deck the whole time. Especially nice in your opening hand alongside charge counter generation and a mana outlet.
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Surge Node: Early source of charge counters, consider putting Ensoul Artifact on it when it runs dry. Or leave it for when you top deck Contagion Engine.
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Energy Chamber: Buff some Ensoul Artifact targets, Coretappers, or Titan Tokens. Especially deadly when you have Winding Constrictors. Otherwise, charge counter generation.
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Lux Cannon: The Space Toaster 9000 is a classic go-to for board control.
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Ratchet Bomb: This is one of the few things between you and early creatures rolling your face. Otherwise, it generates charge counters for Power Conduit, which is why this is here and not Engineered Explosives. Remember that a 0-charge bomb destroys tokens, and Ratchet Bomb can destroy YOUR permanents too.
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Power Conduit: Pull charges and +1/+1 your Winding Constrictors. Speed up the emptying out of card:Surge Nodes. Move counters from where they were made / you wanted them before to where you need them now.
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Sunset Pyramid: Desperately needed draw power. Try to leave one brick counter at the end for Contagion Engine to proliferate. A good Prototype Portal target if you're swimming in mana.
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Brain in a Jar: A source of charge counters and a charge counter sink that lets you re-order a good chunk of your deck into a horrifying slew of consecutive top-deck jankness.
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Ensoul Artifact: There is nothing quite like a turn 2 indestructible 5/5 when you have this + Darksteel Citadel + Glimmervoid / Spire of Industry. Take a seat, Phylactery Lich. Also makes a good base target for +1/+1 counters.
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Karn Liberated: A Lux Cannon that exiles hand or board and can restart the game with all your opponent's stuff? Yes please.
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Contagion Engine: An absolutely atrocious mid/late game card. With a Winding Constrictor you can potentially use all Lux Cannons / Titan Forges every turn for 4 mana, restore brick counters on Sunset Pyramid, and give some loyalty counters to Karn Liberated and Karn, Scion of Urza. Also interacts well with the Energy Chamber + Power Conduit + Winding Constrictor
combos.
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Winding Constrictor: This card is insane enough to break colorless for in a counter deck. Literally everything that uses/applies counters in this deck becomes that much more absurd with this creature out.
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Titan Forge: Does a 9/9 on turn 3 or 4 from outside charge generation seem attractive to you? Outside of early play, it makes a great charge counter sink.
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Coretapper: If you dropped this on turn 2, you can drop a Titan Forge and crank out a Titan Token on turn 3 with tap + sac. Otherwise, it can fire a Lux Cannon in an emergency, generate charge counters, or be a juicy +1/+1 target for Power Conduit / Energy Chamber when you have Winding Constrictor(s) out.
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Prototype Portal: Turns card:Coretappers into 2 mana charge 3 drops, allows the spamming of Darksteel Citadel, hyper-spamming of card:Voltaic Keys, etc. Has good synergy for when your opponent destroys an artifact and you trigger Academy Ruins or Buried Ruin to route it back to your hand.
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Voltaic Key: Mana sink and indirect charge counter sink. Useful for Lux Cannon / Titan Forge / etc. It can also be used as pseudo-vigilance by untapping an artifact creature after combat.
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Karn, Scion of Urza: Extra draw power and artifact creatures that scale off your artifact count.
