Witches' Eye is a uncommon Artifact — Equipment card from The List (PLST), collector number THS-222. Current market price: $0.16, TCGplayer market prices via Scryfall.
Equipped creature has "{1}, {T}: Scry 1." (To scry 1, look at the top card of your library, then you may put that card on the bottom.) Equip {1}