For 5 turns your king and queen wear each other's crowns and lying labels. Purely cosmetic: rules, legality and hitboxes are completely unaffected.
You draft Counterfeit Crown in either mode. Instant: it takes effect the moment you draft it.
As a item card, it is a one-use consumable, drafted in either mode.
“Genuine royal headwear, says the man selling it from a coat.”
Needs one of your queens in play.