Isochron Scepter is a uncommon Artifact card from The List (PLST), collector number MRD-188. Current market price: $15.56, TCGplayer market prices via Scryfall.
Imprint — When this artifact enters, you may exile an instant card with mana value 2 or less from your hand. {2}, {T}: You may copy the exiled card. If you do, you may cast the copy without paying its mana cost.