Power Sink (3ED) from Revised Edition, 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 must draw and spend all available mana from lands and mana pool until X is spent; he or she may also spend mana from other sources if desired. If this is not enough mana, target spell will still be countered.