Ambassador

 The ambassador can exchange their cards with cards from the court deck.

He is also is able to block stealing.

Specifics
When a player exchanges their cards, they will take two cards from the court deck and keep a number of cards equal to the amount of influence that player has. For example, if a player has two influence then they will take two cards from the court deck, add it to the two they already have, and choose any two to keep. If a player has only one influence then they will take two cards from the court deck, add it to the one they have, and choose one to keep.

If a player correctly challenges an exchange claim, then the person who claimed ambassador will lose an influence and will not be able to exchange. If a player gets incorrectly challenged and reveals the ambassador, then they will shuffle it back into the court deck and draw a new face-down card to replace it. The challenger will lose an influence for being wrong. The original player will still be able to carry out their exchange. 

 