Seer of Stolen Sight is a uncommon Creature — Phyrexian Warlock card from March of the Machine (MOM), collector number 330. Current market price: $0.29 (foil $0.35), TCGplayer market prices via Scryfall.
Menace (This creature can't be blocked except by two or more creatures.) Whenever one or more artifacts and/or creatures you control are put into a graveyard from the battlefield, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)