S.H.I.E.L.D. Spy Kit is a common Artifact — Equipment card from Marvel Super Heroes (MSH), collector number 36. Current market price: $0.12 (foil $0.28), TCGplayer market prices via Scryfall.
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.)