MTG Treachery

Other players can respond to The Puppet Master’s unveiling triggered ability. They can use their own Identity’s unveil ability while they have priority. Afterwards, those identity cards will be turned face down during the resolution of The Puppet Master’s ability.
Once The Puppet Master’s unveiling triggered ability begins to resolve, no player may take other actions until it’s done. Notably, opponents won’t be allowed to unveil their identity card.
You choose which player gets which identity card when the unveiling triggered ability resolves, except for the control of The Puppet Master identity card who cannot change this way.When The Puppet Master’s unveiling triggered ability starts to resolve, for each other player, you can choose to (a) leave their identity card as they are or (b) exchange control of that identity with another one (not being The Puppet Master). You can’t choose to have a player controls no identity card.

You may look at face-down identity cards during the resolution of the unveiling triggered ability.If a player concedes during the resolution of The Puppet Master’s unveiling triggered ability, their identity card leaves the game and no one gains control of it. If that player would have gained control of another identity card, instead assign that identity card to another player with no identity card assigned.
The Puppet Master’s last ability can trigger only while the identity card is face up.
Each player is changing team according to their new role.