Sublime Archangel (M13) from Magic 2013, available at 401 Games Canada.

• Rarity: Mythic Rare
• Finish: Normal
• Artist: Cynthia Sheppard
• Card Text:
  Flying
  Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)
  Other creatures you control have exalted. (If a creature has multiple instances of exalted, each triggers separately.)