Fucuses on increasing Slots/Number of med items found early game to help your team get through with extra bandages/pain pills.
You transition into Trauma management/Revive speed Mid Game
While having the option to begin pulling SMG/Move speed cards if you need to run for a mission or your team needs more common ridden clearing, the bomb Squad Broadside combo can be completely ignored (Most acts only let you pull 13 ish cards) Or taken to allow you to grenade down commons! Very useful if your team is lacking a melee player.
The Core cards for playing a medic build are Medical Professional and Experienced EMT. The rest are nice to haves or can be adjusted as needed, but these two cards are what are going to make your medkits the most valuable thing for your team.