Muddle the Mixture (RAV) from Ravnica: City of Guilds, available at 401 Games Canada.

• Rarity: Common
• Finish: Normal
• Artist: Luca Zontini
• Card Text:
  Counter target instant or sorcery spell.
  Transmute 1UU (1UU, Discard this card: Search your library for a card with the same converted mana cost as this card, reveal it, and put it into your hand.
  Then shuffle your library. Play only as a sorcery.)