Card 2 - The HIgh Priestess: Peggy Carter
The High Priestess is a guide into another, secret, world that is beyond our imagination. Peggy Carter takes on that role for Steve Rogers in many ways. She is the one who guides him to the laboratory where everything will change. She offers illumination in other ways, such as when she advises Steve to respect Bucky’s choice while Steve is grieving. Her position as an agent for a secretive organization also qualifies her for this role.
In this card, Peggy opening the door (hidden behind a bookcase, appropriately enough) to the laboratory where Steve Rogers will become Captain America. The change he will go through is not just physical, but an amplification of what he is deep inside, spiritually. Her finger is to her lips, reinforcing the secret nature of what is to happen. The edge of the door on one side of Peggy and the coat rack on the other are meant to be indicative of the two pillars that are frequently associated with this card. There are also a few other elements from the card scattered about as well.
(Yes, all of the cards have drawn from Captain America so far, but that changes starting with the next card.)