Chaotic Backlash

Color-hate weaponized as a finisher, and the math is what gives it teeth. Most punisher cards in this lineage scaled off a single resource (a card type, a count of cards in hand), but this one keys off something an opponent actively wants more of: white and blue permanents in play. Against a dedicated UW deck, the count climbs as the board develops (creatures, planeswalkers, enchantments, and any artifacts that happen to be white or blue), and doubling it converts that footprint into a lethal number from a single instant. Note the precise scope: lands are colorless, so even Plains and Islands add nothing to the count. It is the spellcasters and the permanents they leave behind that feed it, not the manabase. Instant timing is the whole reason it functions as more than a curiosity: fire it at the end of their turn, after they have committed creatures, walkers, and enchantments to the board, and the multiplier resolves against the largest count they will field. A defender who has overextended into a long game is the one who hands you the kill. The constraint that defines it is also the price of the ceiling: point it at a board with no white or blue permanents and it deals exactly zero. It belongs to the old tradition of color-specific hate that read as flavor and punishment at once, turning an opponent's commitment to a color pair against them rather than offering a rate that holds up across the field.