Bitter Feud

Pure political theater dressed up as an enchantment. Rather than dealing damage or pumping a creature, this points two players at each other and turns every point of damage between them into two: it is a lever you pull on someone else's combat math, not your own. The trick is that you choose the two players, and nothing says you have to be one of them. Drop it between the two biggest threats at the table and you have manufactured a brawl you watch from the sidelines, with each commander hitting twice as hard, each board wipe biting deeper, each Lightning Bolt suddenly worth six. The design only works in a format with more than two seats, which is why it exists as a multiplayer kingmaker rather than a duel card: in a one-on-one game it just hands both players a damage doubler, but at a crowded table it is a thumb on the scale the affected players can feel yet cannot easily lift without spending their turn unwinding your enchantment instead of advancing their own game. Best used by the seat that has read the table correctly, it accelerates a conflict already brewing while leaving your own life total untouched. Group-slug enablers like this turn the social layer of multiplayer into a mechanical one, and few do it as bluntly as doubling damage in a feud you never have to join.