Hidden trackable information in games sucks!
I play games for fun and pursuing the goal to win the game is fun! :)
It sounds impossible, but it was happened.
In the same turn:
- The Great Wall builds discard pile stage
- Halicarnassus builds discard pile stage
- Rome builds a wonder stage and (just for fun) enters Solomon.
What happens in this situation?
This is explicitly stated on p. 2 of the rules of Wonder Pack:
P. 2 of the rules of Wonder Pack wrote:
If multiple players take cards from the discard pile during a given turn, the resolution order is the following: Halikarnassós, The Great Wall, Manneken Pis, Salomon and finally, the Courtesan’s Guild.