Finest Hour (ARB) from Alara Reborn, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Michael Komarck
• Card Text:
  Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)
  Whenever a creature you control attacks alone, if it's the first combat phase of the turn, untap that creature. After this phase, there is an additional combat phase.