Hamletback Goliath (CM2) from Commander Anthology Volume II, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Paolo Parente & Brian Snõddy
• Card Text:
  Whenever another creature enters the battlefield, you may put X +1/+1 counters on Hamletback Goliath, where X is that creature's power.