Unravel

Most hard counters are pure denial: they trade one card for one card and leave you empty-handed the moment the game slows down. This one attaches a rider to the exact thing counterspells are worst against, which is the opponent squeezing extra value out of a spell they didn't pay full price for. Alternative costs, cost reducers, Convoke, Delve, affinity: any time a spell is cast for less mana than its printed value, the counter refunds you a card. The design reads the mana actually spent against the mana value on the card, so it rewards catching the payoff turn precisely, the moment an opponent tries to cheat the curve. Against a straightforwardly cast three-drop it's just a clean counter with no replacement, which is the honest tax on the ability: you only get the card when the opponent got a discount, and you're punishing the discount rather than the spell itself. That framing makes it a specialist's counter, tuned for metagames where cost-cheating is the way big things get onto the battlefield, and a plain answer everywhere else. It sits in the lineage of counters that try to close the card-disadvantage gap without lowering the mana floor, but where most of those pay you unconditionally, this one pays you only when the opponent was trying to get away with something.