Cunning Rhetoric (CMM) from Commander Masters, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Chris Rallis
• Card Text:
  Whenever an opponent attacks you and/or one or more planeswalkers you control, exile the top card of that player's library. You may play that card for as long as it remains exiled, and mana of any type can be spent to cast it.