Curse of Bloodletting

Most damage amplifiers attach to a source or a creature; this one attaches to a victim. It enchants a player, and from then on it doesn't care where the hit originates: your attackers, your burn, a sweeper that happens to splash onto the enchanted player, even effects that player aims at themselves all land for twice the damage. The replacement effect rewrites the number on the way in, so a swing that would deal six now deals twelve, and it does so without any setup beyond the Aura itself. That makes it a force multiplier on top of whatever line you were already running, which is why it belongs in builds that funnel everything toward one target rather than spread pressure around. The five-mana price is the brake: you spend a turn casting an Aura that deals no damage on its own and broadcasts exactly who the table should worry about, all before it converts a single point. It sits in the line of Curse enchantments that turn one opponent into a focal point, but where most of those bleed value incrementally, this one is binary. It does nothing until damage flows toward the enchanted player, then it turns a survivable hit into a lethal one. Stack a second amplifier and the doubling rides on top of the inflated figure, so the math sprints past any reasonable life total fast. The floor is a card that sits inert until you can route enough damage at the right player to make the multiplication matter.