Put a party hat on any piece on the board, forever (purely decorative). If it is one of yours, it cannot be captured for your opponent's next 2 turns: nobody ruins a party.
You draft Party Hat 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.
“Mandatory fun has entered the square.”