Eye of Jace is a uncommon Artifact card from Reality Fracture (FRA), collector number 170. Current market price: $0.25 (foil $0.22), TCGplayer market prices via Scryfall.
At the beginning of your upkeep, surveil 1. Then if there are seven or more cards in your graveyard, sacrifice this artifact, it deals 2 damage to each opponent, and you gain 2 life. (To surveil 1, look at the top card of your library. You may put it into your graveyard.)