Cheapest priced copy (The List): $0.35 at Card Kingdom, near mint, their price list as of .
Thran Forge 
Artifact · Uncommon · The List · #WTH-159
{2}: Until end of turn, target nonartifact creature gets +1/+0 and becomes an artifact in addition to its other types.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.35 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The List | WTH-159 | Uncommon | $0.35 | — |
| Weatherlight | 159 | Uncommon | $0.35 | — |
2 rulings from Wizards of the Coast
- 1 November 2005Now becomes an artifact in addition to its other types.
- 1 April 2008If Thran Forge’s ability is activated targeting a nonartifact creature, then it’s activated again in response targeting the same creature, the second instance will resolve. The first instance will then be countered for having an illegal target, since the target is no longer a nonartifact creature.