Marchesa's Decree
Seizing the crown is easy; keeping it is where most monarch payoffs leave you exposed, since the fastest way to steal the title back is to connect with a creature in combat. This one turns that vulnerability into a toll booth. Every attacker aimed at you loses its controller a life point simply for swinging, so the obvious plan (send in a creature, take the crown) starts charging admission on every assault rather than only on the strike that finally lands. Per attacker the drain is trivial; across a wide board it becomes a self-inflicted bleed, punishing exactly the go-wide swing an opponent would use to wrestle the title away. The same clause protects planeswalkers you control, which loosens a real constraint on the monarch: the instinct to keep creatures home on defense. Under this tax you can point loyalty abilities at the table while the attack penalty does the deterring. The entry line that hands you the crown outright is the operative one, making this a four-mana purchase of both the extra card and a fortified throne. It rewards a controlling black shell that wants the card advantage and would rather make aggression hurt than trade blockers for it.
