name: Logic Knot
originalText: Delve (You may exile any number of cards from your graveyard as you cast this spell. It costs {1} less to cast for each card exiled this way.)\nCounter target spell unless its controller pays {X}.
printings: FUT, MMA, TSR
text: Delve (Each card you exile from your graveyard while casting this spell pays for {1}.)\nCounter target spell unless its controller pays {X}.
type: Instant