Yoke of the Damned

Removal that fires on someone else's clock. The aura sits inert on a creature until any creature dies, anywhere on the battlefield, at which point the enchanted target is destroyed. That delay is the whole design problem and its whole charm: the trigger is universal, so a single chump block, a token expiring to a combat trade, a sacrifice effect, or your opponent's own removal spell all become the detonator. The cost is the loss of control. You do not choose when the kill resolves; you set the trap and wait for the board to provide the body. Against a static board it does nothing for turns; against the churn of an aggressive or token-heavy game it can resolve almost immediately, sometimes off a death you arrange yourself with a sacrifice outlet. The design ancestry runs through delayed-doom auras like Pillory of the Sleepless and the older creeping-death effects, but where most aura removal neutralizes a creature on a fixed timer or by shrinking it, this one keeps the target alive and fully functional until the condition is met, which means the enchanted creature can still attack, block, and trade in the interim. The single conditional reframes the whole transaction: you spend no resources pulling the trigger, only the patience to read how dying tends to go on a given board, and the discipline not to enchant something you needed dead right now.