Galvanic Blast (2XM) from Double Masters, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Marc Simonetti
• Card Text:
  Galvanic Blast deals 2 damage to any target.
  Metalcraft — Galvanic Blast deals 4 damage to that permanent or player instead if you control three or more artifacts.