A stunt Double is a body double who replaces an actor in a dangerous film. So, this business card represents this job in a metaphorical way.
A lion tamer is a person who trains a lion for a circus or a public. Because this business card is for a lion tamer, I put lion fur on the back side of the card to show his strength.
Business card is not just a card bearing business information about a company and an individual. This envelope-looking business card includes miniature buildings.