Cheapest priced copy (Marvel Super Heroes): $0.99 at Card Kingdom, near mint, their price list as of .
Arc Reactor 
Artifact · Rare · Marvel Super Heroes · #243
Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.)
This artifact enters tapped.
{T}: Add {C}{C}{C}.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
2 printings · $0.99 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Marvel Super Heroes | 243 | Rare | $0.99 | $1.49 |
| Marvel Super Heroes | 310 | Rare | $1.99 | $2.49 |