War Cadence

Falter effects (the temporary "creatures can't block" trick that ends a stalled board) almost always come as one-shot instants: pay a few mana, force the swing through, hope it's lethal. The repeatable, scalable version is the rarer design, and that is what this enchantment offers. Rather than a flat tax, it sells the unblockability by the creature: each blocker the defender wants to keep up costs them , and you set by how much mana you sink into the activation. The result is a sliding price war fought across the combat step. A defender with one big blocker pays once and shrugs; a defender hiding behind a wall of chump fodder watches the tax multiply per body, which is precisely when the aggressor most needs the lane opened. Because the cost is split between you and the opponent (you pay to set the rate, they pay to ignore it), the card scales with the mana both players have left rather than with a single fixed number, and it stays on the battlefield to threaten the same squeeze on a later turn. That permanence is the structural distinction from the disposable Falter spells: an opponent who survives one alpha strike has not removed the engine, only delayed it, and must keep mana banked every turn the enchantment sits in play.