Power Leak (LEB) from Limited Edition Beta, available at 401 Games Canada.

• Rarity: Common
• Finish: Normal
• Artist: Drew Tucker
• Card Text:
  Target enchantment costs 2 extra mana each turn during upkeep. If target enchantment’s controller cannot or will not pay this extra mana, Power Leak does 1 damage to him or her for each unpaid mana.