Azorius Guildmage (DIS) from Dissension, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Christopher Moeller
• Card Text:
  ((W/U) can be paid with either W or U.)
  2W: Tap target creature.
  2U: Counter target activated ability. (Mana abilities can't be targeted.)