Eye of Malcator is a common Artifact card from Phyrexia: All Will Be One (ONE), collector number 50. Current market price: $0.14 (foil $0.15), TCGplayer market prices via Scryfall.
When this artifact enters, scry 2. (Look at the top two cards of your library, then put any number of them on the bottom and the rest on top in any order.) Whenever another artifact you control enters, this artifact becomes a 4/4 Phyrexian Eye artifact creature until end of turn.