Cheapest priced copy (Fifth Edition): $0.35 at Card Kingdom, near mint, their price list as of .
Ashnod's Transmogrant 
Artifact · Common · Fifth Edition · #350
{T}, Sacrifice this artifact: Put a +1/+1 counter on target nonartifact creature. That creature becomes an artifact in addition to its other types.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
5 printings · $0.35 to $4.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Fifth Edition | 350 | Common | $0.35 | — |
| Antiquities | 40 | Uncommon | $4.99 | — |
| Chronicles Foreign Black Border | 93 | Common | — | — |
| Chronicles | 93 | Common | $0.35 | — |
| Rinascimento | 103 | Uncommon | — | — |
One ruling from Wizards of the Coast
- 16 September 2007It’s the ability, not the counter that makes the creature an artifact. The creature remains an artifact even if the +1/+1 counter is removed.