Vedalken Archmage Market Price: $11.87 It may not be an artifact, but Archmage is a great representative of the many cards in Mirrodin that synergize fantastically with the card type
But in a set where Shock was printed, thats a big deal
It does require tapping, so you'll need to wait a turn to use it normally, but you can easily combine it with Commander Classics Swiftfoot Boots and Lightning Greaves to protect it and haste it in one swing
If you can't win the game in that extra turn, you automatically lose the game
For that reason, I'd love to see it as a 'Secret Commander', but probably not the Command Zone proper
The most powerful thing our deck can do is play a couple of magecraft creatures, play a bunch of spells to pump them into massive threats, and kill our opponent by Turn 3 or 4