Instill Furor

An aura that hands its target a liability and nothing else: no buff, no body, no upside, just a recurring sacrifice clause that fires at the start of the controller's end step unless that creature attacked. That shape only makes sense pointed across the table. The intended target is an opponent's blocker or sitter: the enchanted creature now either marches into the red zone every turn or dies, which means a wall can no longer simply hold the ground it was built to hold. It is removal that lets the opponent choose the manner of removal, and the choice is genuinely uncomfortable when the creature is positioned to defend rather than attack. The friction is that the leash never tightens on its own. Because the trigger checks each of the controller's end steps, an opponent who is willing to keep swinging keeps the creature indefinitely, so the aura coerces aggression out of a defender rather than guaranteeing a kill. That makes it a removal spell with a built-in escape hatch the opponent controls, and one that does the least when the target was happy to attack anyway. It belongs to red's long tradition of forced-combat effects, the curses and goads that punish a creature for standing still, but as an aura it commits mana and a card to a coercion the opponent can pay their way out of. The result reads cleaner as a concept (turn their blocker into your problem) than it plays as a sorcery-speed two-mana investment that demands the right defensive target to matter.