When I read the new plot card 'Common Cause' I wondered when exactly the claim value is determined.
As I understand it, it is more like a dynamic concept. When someone wins a challenge, he/she looks at his/her plot card, takes that value, adds or subtracts modifiers if there are any, and then the claim effect is implemented. No problem at all.
But if you look at 'Common Cause', you cannot do it like this. What if your opponent has 'Forgotten plans' as his/her revealed plot card? The text box of your 'Common cause' would be blanked in every phase except the plot phase. So, you have a claim value of 'X', but you cannot determine 'X' in any phase except plot phase because you have a blanked text box then.
So you would have to determine the 'X' value of 'Common cause' in the plot phase? Then every character you would play/put into play after the plot phase could not add his house affiliation to your 'X'-value. This would work, but it would be neither fair nor logical in my opinion.
What do you think about this? Did I miss something important (like an entry in the FAQ where the exact time to determine the claim value is described; I could not find such) or is there really a problem here?