Blustersquall

Tapping a single creature for one blue mana is a trick so minor that no deck would run it on rate alone; the whole point is that the same card scales into a one-sided Falter once you can afford the overload. That cost ladder turns "tap target creature you don't control" into "tap each creature you don't control," splitting the card cleanly between a marginal combat fog and a full alpha strike: every blocker the opponent has goes sideways, and your team swings into an empty board. The discipline in the design is that the cheap mode stays legal and useful early, then the blowout waits in the same card for late, so it never sits dead in hand the way a fixed-cost mass-tap would. The instant timing is where the real windows open. Cast it at the beginning of combat on your own turn and the opponent has no untapped blockers when you reach declare blockers; cast it on their beginning of combat and their would-be attackers are tapped before they can be declared, costing them an entire offensive turn. It destroys nothing, which is the restraint that separates it from a true sweeper: the tempo it buys is a single turn of clear air, not a permanent answer. That ceiling is exactly why it belongs in aggressive tempo shells that need only one unblocked swing to close.