Thank you all for your kind replies..
I have a savegame where i completed the campaign, but haven't found a way to go back on the maps. I cannot even start the savegame again so I guess I have to start all over again to get the missing cards.
The one I'm missing is the premium Version of Kelltulis. Anyone knows where to find it?
Edit: Just got it in Mahakam, had to free a dwarf woman to get her map of a hidden chest i missed.