Logic Knot (FUT) from Future Sight, available at 401 Games Canada.

• Rarity: Common
• Finish: Normal
• Artist: Glen Angus
• Card Text:
  Delve (You may remove any number of cards in your graveyard from the game as you play this spell. It costs 1 less to play for each card removed this way.)
  Counter target spell unless its controller pays X.