Guan Yu's 1,000-Li March

Most sweepers ask nothing of you beyond paying the mana and accepting the symmetry. This one hands you the steering wheel: it kills only what is tapped, which means the board it clears is, in large part, the board your opponents built last turn. Attackers that swung in are tapped. Creatures that activated a tap ability are tapped. The mana dorks that fueled a big play are tapped. Everything that sat back on defense, vigilant blockers and untapped utility creatures, survives. That turns a six-mana board wipe into a punish for the player who committed to the offensive, and it lets a controller untap and keep its own forces intact while the attacking side loses its army. The cost of that selectivity is timing: as a sorcery, it cannot ambush an attack mid-combat the way an instant-speed sweeper would. You clear the wreckage on your own turn, after the swing has already landed, so the math is about the next attack rather than the current one. It belongs to a small family of conditional white wraths that trade unconditional reach for control over which creatures die, rewarding a deck built to keep its own threats upright while goading or forcing opponents to tap out.