Battlegrace Angel (ALA) from Shards of Alara, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Matt Stewart
• Card Text:
  Flying
  Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)
  Whenever a creature you control attacks alone, it gains lifelink until end of turn.