Maddening Hex (AFC) from Forgotten Realms Commander, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Bryan Sola
• Card Text:
  Enchant player
  Whenever enchanted player casts a noncreature spell, roll a d6. Maddening Hex deals damage to that player equal to the result. Then attach Maddening Hex to another one of your opponents chosen at random.