Entering the Masquerade

During their turn, any player may pay {1}. If they do so, target creature they control will be treated as the single colour of their choice, until the end of turn.
If 5 or more creatures share a colour, they all get -4/-0. If 2 or less creatures share a colour, those creatures get +3/+0 and Menace.
"It's the masquerade ball. Play the game, and try not to die."