Cheapest priced copy (Darksteel): $0.35 at Card Kingdom, near mint, their price list as of .
Barbed Lightning 
Instant · Common · Darksteel · #55
Choose one —
• Barbed Lightning deals 3 damage to target creature.
• Barbed Lightning deals 3 damage to target player or planeswalker.
Entwine {2} (Choose both if you pay the entwine cost.)
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Darksteel | 55 | Common | $0.35 | $0.49 |