This particular card is unique which means there can only be one of that particular card on the table at any given time. It has vitality which means that when the character is killed, it returns to your hand instead of going to your discard pile. The card color is represented by the border around the illustration and also the symbol behind the resources needed number. The illustration is just for show. Other card types are actions and combat cards.
Actions have a symbol that resemble arrows pointing in two different ways.
These are one-time things, and are used only during your turn, and only before and after combat. Combat cards are like action cards, but they are a surprise to the other player and are played during combat on either person's turn. Combat and action cards don't have power, and instead of special abilities they just say what to do when you play the card. The last card type is a resource card. These cards are like money in that you must have a specified number of resources to play a card.