Panoptic Mirror 136 (Darksteel)

Imprint — {X}, {T}: You may exile an instant or sorcery card with mana value X from your hand. At the beginning of your upkeep, you may copy a card exiled with this artifact. If you do, you may cast the copy without paying its mana cost.

NM - $50.60
LP - $40.50
MP - $30.40
HP - $20.30
DMG - $10.20