Cheapest priced copy (Marvel Super Heroes): $0.35 at Card Kingdom, near mint, their price list as of .
S.H.I.E.L.D. Spy Kit 
Artifact — Equipment · Common · Marvel Super Heroes · #36
Equipped creature gets +1/+1.
Whenever equipped creature attacks alone, untap it and scry 1. (Look at the top card of your library. You may put that card on the bottom.)
Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)
Legal inCommanderBrawlStandardPioneerModernLegacyVintagePauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Marvel Super Heroes | 36 | Common | $0.35 | $0.49 |