Gainsay

A hate card aimed at a single color, priced low enough to actually run, but only ever live against itself. The narrow target is the whole bargain: by restricting the counter to blue spells, the cost can drop below a generalist counter's, because the card does nothing in any matchup that does not cast blue. That makes it a mirror-breaker by construction, an answer to the attrition that defines control-on-control fights, where the deck most likely to be casting the heaviest blue threats is the one across the table. It belongs to a lineage of color-hosed counters that trade flexibility for rate, each tuned to punish a specific archetype rather than the whole field. The design tension it resolves is the perennial counter-magic problem: a hard counter that always works is expensive, while a cheap one has to give something back. Gainsay gives back universality, and in exchange it becomes one of the few two-mana ways to say no to a blue spell on the stack while holding mana open for your own line. Its honesty is in that limitation: you know exactly when it is live, and you know exactly when it rots in hand.