Cheapest priced copy (Shards of Alara): $0.35 at Card Kingdom, near mint, their price list as of .
Steelclad Serpent 
Artifact Creature — Serpent · 4/5 · Common · Shards of Alara · #59
This creature can't attack unless you control another artifact.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Shards of Alara | 59 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 1 October 2008If you control two Steelclad Serpents, they’ll enable each other to attack.
- 1 October 2008The only difference between a colored artifact and a colorless artifact is, obviously, its color. Unlike most artifacts, a colored artifact requires colored mana to cast. Also unlike most artifacts, a colored artifact has a color in all zones. It will interact with cards that care about color. Other than that, a colored artifact behaves just like any other artifact. It will interact as normal with any card that cares about artifacts, such as Shatter or Arcbound Ravager.