Carnage Wurm (M12) from Magic 2012, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Dave Kendall
• Card Text:
  Bloodthirst 3 (If an opponent was dealt damage this turn, this creature enters the battlefield with three +1/+1 counters on it.)
  Trample (If this creature would assign enough damage to its blockers to destroy them, you may have it assign the rest of its damage to defending player or planeswalker.)