Spell Swindle

Counterspells have always been pure tempo: you spend mana to stop your opponent from spending theirs, and walk away with nothing on the stack to show for it. This rewrites that arithmetic. The bigger the spell you answer, the more Treasure you bank, so the reward scales with the opponent's investment. Stop a six-drop and you are left holding six Treasures, enough to refund the five-mana counter and float a turn's worth of acceleration on top. The design is self-correcting: a cheap spell yields almost nothing, so you are never incentivized to fire this at a one-mana cantrip, but the moment the table commits real mana, the swing becomes enormous. The card is at its most lopsided when the opponent is being greedy, turning their splashy haymaker into your ramp spell. The Treasures do double duty as fixing and as fuel: you are not just denying a spell, you are converting its mana value into a portable, any-color resource that can power out your own threats or, in the right shell, feed an artifact-matters or sacrifice engine. The tax is obvious: five mana held up at instant speed is a heavy reactive commitment, and against a curve of small spells it does very little. Against a deck built to land one expensive thing, it is the most rewarding counter blue offers, answering the threat and pocketing its cost in the same breath.