Cheapest priced copy (Scars of Mirrodin): $0.35 at Card Kingdom, near mint, their price list as of .
Lumengrid Drake 
Creature — Drake · 2/2 · Common · Scars of Mirrodin · #36
Flying
Metalcraft — When this creature enters, if you control three or more artifacts, return target creature to its owner's hand.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Scars of Mirrodin | 36 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 1 January 2011The triggered ability is mandatory. If you control three or more artifacts as Lumengrid Drake enters, you must target a creature. If there are no other creatures on the battlefield, you must target Lumengrid Drake itself. As the ability resolves, if you control three or more artifacts, you must return the targeted creature to its owner's hand.