100% Colorless, Artifact, Charge Counter, Myr Deck deck.
The deck is built around infinite charge counters, mana and myr creature tokens. There are multiple win conditions including unblockable damage with Myr Battlesphere, infinite turns with Magistrate's Scepter, and however you'd describe what Darksteel Reactor does. There are also a few win cons in the side board including Jinxed Choker and Codex Shredder (to name only one of the ways mill can be added to the deck). I am still playing around with what is the most fun for me so I figured I would try to make it customizable to some extent. You can pick and choose what wincons you want to add and have fun side boarding to change things up.
Description from this point down is a bit out of date. All cards mentioned should still be in the deck or sideboard.
Generators
Going infinite in this deck is no special feat. 2 Myr Galvanizer's and a Palladium Myr will create infinite mana. You can replace one of the Galvanizers with a Clock of Omens and 2 extra Myr creatures for the same effect.
Add a Coretapper for infinite charge counters, or a second Palladium Myr and a Myr Propagator for infinite Myr.
If you have the first infinite mana combo AND the Clock of Omens and 1 extra Myr, you can infinitely untap all of your other artifacts.
One nice thing about this generator is that you don't need all of it at once for it to be useful. If you have the 2 Myr Galvanizer's but not a Palladium Myr, you can still untap your Myr creatures as many times as you can pay 1 mana. Similarly with a Clock of Omens and a Galvanizer you can get a lot out of a few extra artifacts.
With a Magistrate's Scepter and a Coretapper you can get extra turns easily, and with 2 Myr Reservoir's, a second Coretapper, and 10 mana per turn you can have infinite turns. You can also get infinite turns with a Scepter, a Coretapper, a Myr Galvanizer, a Clock of Omens, and 2 extra Myr creatures.
There are probably several more ways to create infinite loops not listed here, every time I wrote one down I think I thought of at least one variation on it. Experiment and have fun.
Removal
Lux Cannon is a fun one to pair with Coretapper. Play Lux Cannon, tap coretapper to put one charge counter on lux cannon, sac coretapper to put two more charge counters on lux cannon. Tap Lux Cannon: Destroy target permanent. The sacrificed coretapper can be retrieved as described in the next section. There are also of course the various ways to go infinite and destroy all of your opponent's permanents.
All Is Dust does nothing to you but it can be devastating for anyone not heavily invested in artifacts or eldrazi.
Graveyard and Deck fetching
Myr Reservoir can get almost any of your creatures out of your graveyard. If you don't have a reservoir out or if you need non-myr artifacts you can get your opponent to kill a Myr Retriever, or use a Kuldotha Forgemaster or Trading Post to kill the retriever yourself. The retriever can always be retrieved later when you get a reservoir out.
Kuldotha Forgemaster, Myr Turbine, Shrine of Piercing Vision, and Inventors' Fair let you search your deck for whatever artifact you need at the time and you can use Myr Retriever and Myr Reservoir as mentioned above to get any sac'd artifacts back from the grave.
Win Conditions
The original wincon from the first version of this deck is Darksteel Reactor. Alone it functions like a 4 drop win-in-20-turns but with just one Coretapper plus an Unwinding Clock, Myr Galvanizer, or a Clock of Omens the timer is brought down to a handful of turns. Get an infinite generator going and it becomes an instant win.
If you want to annoy your opponents you could go for infinite turns with Magistrate's Scepter. From there you can take out your opponent however you want.
Another wincon I threw in there for fun is Jinxed Choker. Load it up with charge counters and send it on it's way. Works well with infinite charge counters or to finish of an already weakened opponent.
With cards like Myr Battlesphere and Door of Destinies there is always the option to beat your opponent to death the old fashioned way.
Utilities and Honorable Mentions
Darksteel Forge, no description necessary.
Genesis Chamber can help kickstart a lot of things and you can use Clock of Omens to tap it to prevent your opponents from mooching the benefits.
Golden Urn can help recover lost health. This can help a lot when facing a flying heavy deck, as this deck contains no flyers nor reach to block with.
Prototype Portal with the right infinite generator can get you infinite copies of an artifact. Even without infinite you can get a lot out of copying an artifact. You can also make a few copies of an artifact, sac the Portal, and retrieve it with Myr Retriever to switch what you are copying.
Unwinding Clock and Shimmer Myr can make for some rapid development and help you keep an edge in larger multiplayer matches.
