Silverblade Paladin (AVR) from Avacyn Restored, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Jason Chan
• Card Text:
  Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)
  As long as Silverblade Paladin is paired with another creature, both creatures have double strike.