Elderscale Wurm (M13) from Magic 2013, available at 401 Games Canada.

• Rarity: Mythic Rare
• Finish: Normal
• Artist: Richard Wright
• Card Text:
  Trample
  When Elderscale Wurm enters the battlefield, if your life total is less than 7, your life total becomes 7.
  As long as you have 7 or more life, damage that would reduce your life total to less than 7 reduces it to 7 instead.