The grand carnival: every one of your pieces (your king excepted) is dressed from the trunk, forever (purely decorative), and none of your pieces can be captured on your opponent's next turn.
You draft Crown of Masks in either mode. Activated: you choose when to use it, and using it is your move for that turn.
As a item card, it is a one-use consumable, drafted in either mode.
“An army nobody recognizes is an army nobody expected.”