Cheapest priced copy (World Championship Decks 1999): $1.29 at Card Kingdom, near mint, their price list as of .
Covetous Dragon 
Creature — Dragon · 6/5 · Rare · Urza's Destiny · #80
Flying
When you control no artifacts, sacrifice this creature.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $1.29 to $299.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Urza's Destiny | 80 | Rare | $5.99 | $299.99 |
| World Championship Decks 1999 | kb80 | Rare | $1.29 | — |
2 rulings from Wizards of the Coast
- 4 October 2004The ability will trigger if you don’t control an artifact, even for a brief moment during the resolution of another spell or ability.
- 4 October 2004The ability only checks if you control no artifacts at the time it triggers. It does not check again on resolution. So gaining control of an artifact before then will not save the Dragon.