Gyarados - 20/98 - Rare - Reverse Holo from XY: Ancient Origins, available at 401 Games Canada.

• Rarity: Rare
• Finish: Reverse Holo
• Artist: Shin Nagasawa
• Card Text:
  [2W] Berserker Splash (80)
  This attack does 10 damage to each Benched Pokemon (both yours and your opponent's). (Don't apply Weakness and Resistance for Benched Pokemon.)
  [3W] Aqua Tail (90+)
  Flip a coin for each Water Energy attached to this Pokemon. This attack does 30 more damage for each heads.