Cheapest priced copy (Mirrodin Besieged): $0.35 at Card Kingdom, near mint, their price list as of .
Silverskin Armor 
Artifact — Equipment · Uncommon · Mirrodin Besieged · #132
Equipped creature gets +1/+1 and is an artifact in addition to its other types.
Equip {2}
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.35 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mirrodin Besieged | 132 | Uncommon | $0.35 | $0.99 |
One ruling from Wizards of the Coast
- 1 June 2011The equipped creature will remain whatever color(s) it was previously. Becoming an artifact doesn’t make the creature colorless.