Cheapest priced copy (Double Masters): $0.35 at Card Kingdom, near mint, their price list as of .
Treasure Mage 
Creature — Human Wizard · 2/2 · Uncommon · Mirrodin Besieged · #34
When this creature enters, you may search your library for an artifact card with mana value 6 or greater, reveal it, put it into your hand, then shuffle.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
5 printings · $0.35 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Double Masters | 73 | Uncommon | $0.35 | $0.49 |
| DCI Promos | 67 | Uncommon | $0.99 | — |
| Duel Decks: Elves vs. Inventors | 40 | Uncommon | $0.35 | — |
| Mirrodin Besieged | 34 | Uncommon | $0.35 | $2.49 |
| The List | DDU-40 | Uncommon | $0.35 | — |
One ruling from Wizards of the Coast
- 7 August 2020If a card in a player's library has {X} in its mana cost, X is considered to be 0.