Serperior - 13/149 - Holo Rare - Reverse Holo from Black & White: Boundaries Crossed, available at 401 Games Canada.

• Rarity: Holo Rare
• Finish: Reverse Holo
• Artist: Mizue
• Card Text:
  [1G] Double Slash (50x) Flip 2 coins. This attack does 50 damage times the number of heads.
  [2G] Mega Drain (70) Heal 30 damage from this Pokemon.