*Name: Power Sink
Type: Interrupt
Play Cost: X colorless, 1 Island
Game 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.
*Source: Front of card
*Name: Power Sink
Type: Instant
Play Cost: X Colorless, 1 Island
Game Text: Counter target spell unless its controller pays X. If he or she doesn't, that player taps all lands with mana abilities he or she controls and empties his or her mana pool.
*Source: gatherer.wizards.com