Growth - If I play two Growth cards, can I build a city for one ore?
Artisans & Benefactors
No. You always can only play one Action Card at a time.
Guido the Great Diplomat - Before playing Guido, can I pick up the active Excommunication I placed on the discard pile so I can see the top card?
Artisans & Benefactors
Yes.
Note: The Excommunication belongs to the theme set "Politics & Intrigue". All expansions of the CATAN Card Game can be found in the Ludography.
Guido the Great Diplomat - Can I play Guido after building the Stone of Wisdom?
Artisans & Benefactors
No.
Note: The Stone of Wisdom belongs to the theme set "Wizards & Dragons". All expansions of the CATAN Card Game can be found in the Ludography.
Guido the Great Diplomat - Can I search the discard pile before I play this card, to look at my opponent’s topmost Attack Action Card?
Artisans & Benefactors
No.
Guido the Great Diplomat - If my game partner placed an active Excommunication on the discard pile, do I get this Excommunication card?
Artisans & Benefactors
No. What you receive is your game partner’s last discarded Attack Action Card, not his last played Attack Action Card.
Note: The Excommunication belongs to the theme set "Politics & Intrigue". All expansions of the CATAN Card Game can be found in the Ludography.
Hospital - If I have used the Hospital, then lose it by means of a failed Arsonist and afterwards build a new Hospital on the same turn, can I use the function once again?
Artisans & Benefactors
Yes.
Hospital - When do I get the star if I have a Hospital?
Artisans & Benefactors
At some point during your turn. You determine the moment yourself.
House of the Benefactor - If I am allowed to draw two cards, and I want to pay one gold to take a Work of Art from the discard pile – must I first do the latter or can I also first try to randomly draw a Work of Art from an Expansion Card stack?
Artisans & Benefactors
That’s up to you.
Lancer - Can I use the Horse Farm to move the Lancer onto another road?
Artisans & Benefactors
No.
Note: The Horse Farm belongs to the theme sets "Trade & Change". All expansions of the CATAN Card Game can be found in the Ludography.
Lancer - Do the Lancers also protect from the Brigands?
Artisans & Benefactors
No.
Lancer - If I receive another Lancer with the help of a Spy, can I build a second Lancer?
Artisans & Benefactors
Yes, if the 2nd strength point is important to you.
Public Feeling - Can I exchange regions adjacent to a Public Feeling with the help of the Border Conflict, Land Reform, or the Land: Change Thyself! card?
Artisans & Benefactors
Yes.
Note: The cards mentioned in the question are part of the CATAN Card Game, which can be found in the Ludography.