Thanks for playing! We started with the idea of having a full deck building but decided on instead treating the cards as supplies. The goal is to make play revolve around the caravan members, so for example a Medic would carry a pistol and some bandages. If a member were to die, then the deck would get smaller as the caravan can carry less.
After the third fight you get to recruit some new members who add cards to the deck. There's also the mechanic of members having effects when they tag in and out (green arrows) that we experimented with.