Epics are large User Stories that span multiple development cycles and releases. They are usually not expressed with User Story cards as the level of details at the Epic stage is not granular enough for a User Story. Instead, you can use this template to collect the information about your Epics, build your Epic backlog, and prioritize it using your favorite prioritization method.
Download the Epic development form (scroll to page 3), and print as many copies as you need. You need one copy for each Epic you intend to research, plan or develop. The template also includes a User Story/Feature card.