Galvanic Juggernaut (ISD) from Innistrad, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Lucas Graciano
• Card Text:
  Galvanic Juggernaut attacks each turn if able.
  Galvanic Juggernaut doesn't untap during your untap step.
  Whenever another creature dies, untap Galvanic Juggernaut.