Sun Droplet (ARC) from Archenemy, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Greg Hildebrandt
• Card Text:
  Whenever you're dealt damage, put that many charge counters on Sun Droplet.
  At the beginning of each upkeep, you may remove a charge counter from Sun Droplet. If you do, you gain 1 life.