Seized from Slumber

White does not usually get unconditional destruction on creatures, and when it does, it comes wrapped in a condition tuned to reward the board state white is already trying to build toward. The full price is a stiff five mana at instant speed, but the discount collapses that to two the moment the target is tapped, which reframes the card entirely: it is a punishment for attackers who committed, for blockers exhausted on a swing back, for anything a vigilance-less creature does when it enters combat or activates a tap ability. That timing window is the whole design. A creature that attacks into open white mana is suddenly staring down cheap removal on the crack-back, and the defender gets to sit behind untapped mana and let the aggressor tap out first. It rewards the reactive posture white removal has always occupied while quietly extending white's reach into effects (kill anything, no restriction on type or toughness) that the color is normally denied. The card asks for patience as its cost: play it early against a tapped creature and you spend two mana efficiently; hold it and you keep the threat of a five-mana answer live against anything untapped. It is destruction priced by decision rather than by rate, and the decision belongs to whoever controls the tempo of the turn.