Sorcerous Spyglass is a rare Artifact card from Ixalan Promos (PXLN), collector number 248p. Current market price: $0.48 (foil $2.20), TCGplayer market prices via Scryfall.
As this artifact enters, look at an opponent's hand, then choose any card name. Activated abilities of sources with the chosen name can't be activated unless they're mana abilities.