Cheapest priced copy (Adventures in the Forgotten Realms): $0.35 at Card Kingdom, near mint, their price list as of .
Black Dragon 
Creature — Dragon · 4/4 · Uncommon · Adventures in the Forgotten Realms · #90
Flying
Acid Breath — When this creature enters, target creature an opponent controls gets -3/-3 until end of turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Adventures in the Forgotten Realms | 90 | Uncommon | $0.35 | $0.49 |
| Adventures in the Forgotten Realms | 291 | Uncommon | $0.39 | $1.49 |