I´m just trying to incorporate all developement cards into the solo game. Some are only useful for multiplayer, so I thought about the following changes:
Assassin: If you don´t buy this card and it is removed from play, roll a die: 1-3: A random character card is removed from your area. If you don´t have any character cards, nothing happens.
Spy: If activated, look at the next two cards from both sides.
There are other cards like the Queen or the Pirat. I´m trying to find some solutions for these too in future plays. If you have any ideas, please let me know.