Thought Prison 261 (Mirrodin)

Imprint — When this artifact enters, you may have target player reveal their hand. If you do, choose a nonland card from it and exile that card. Whenever a player casts a spell that shares a color or mana value with the exiled card, this artifact deals 2 damage to that player.

NM - $0.70
LP - $0.70
MP - $0.70
HP - $0.70
DMG - $0.70