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

• Rarity: Common
• Finish: Normal
• Artist: Richard Thomas
• Card Text:
  Target spell is countered unless its caster spends X more mana; caster of target spell can’t choose to let it be countered. If caster of target spell doesn’t have enough mana, all available mana from lands and mana pool must be paid but target spell will still be countered.