Dissolve

Three mana to counter anything is a fair retail price by the design lights of an era when the flat two-mana Counterspell was deemed too strong to reprint at Standard rates, but the scry is what earns Dissolve its slot over cheaper, narrower answers. It bundles a sliver of card selection into a turn you would otherwise spend doing nothing proactive, and that bundling matters more than it looks. A bare counter is pure tempo neutrality: you swap your card for theirs and move on. Scry 1 lets you smooth your next draw off the same spell, bottoming a dead land or tucking a removal spell you do not want yet. It became a template for the three-mana counter-plus-rider line that followed, where the rider is a small library-sculpting effect rather than extra reach: Sinister Sabotage swapped the scry for surveil, and several "counter, then do a little extra" instants kept the shape. The discipline holding it in check is the cost. At three mana you are a full turn behind a two-mana answer, and the scry only fires when there is a spell to counter, so against fast starts where you cannot afford to hold up three and react, the rider never collects. This is the hard counter you reach for when you can pay for certainty and want the reactive turn to advance your own draw by a hair.