The game is currently in pre-Alpha stage of development.
Generally, Alpha is the stage when key gameplay functionality is implemented, the game is playable and contains most major features. These features may be further revised based on testing and feedback. Additional small, new features may be added, similarly, planned but unimplemented features may be dropped.
All elements of the game and cards will still be subject to change during the Alpha phase.
You can check the website's homepage for updates to the roadmap and the Discord server's #announcements channel for other updates on progress and completed milestones.