Paranoid Delusions (GTC) from Gatecrash, available at 401 Games Canada.

• Rarity: Common
• Finish: Normal
• Artist: Christopher Moeller
• Card Text:
  Target player puts the top three cards of his or her library into his or her graveyard.
  Cipher (Then you may exile this spell card encoded on a creature you control. Whenever that creature deals combat damage to a player, its controller may cast a copy of the encoded card without paying its mana cost.)