Cheapest priced copy (Marvel Super Heroes Commander): $0.69 at Card Kingdom, near mint, their price list as of .
Voltaic Whip 
Artifact — Equipment · Common · Marvel Super Heroes Commander · #675
Equipped creature gets +2/+0 and has "Whenever this creature attacks alone, you draw a card and lose 1 life."
Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
1 printing · $0.49 to $0.69 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Marvel Super Heroes Commander | 675 | Common | $0.69 | $0.49 |