KeyForge Call of the Archons is a unique card game (the very first Unique Deck Game!) by Richard Garfield that introduces you to the Crucible, an artificial world where anything is possible.

Here you become a mighty Archon who battles to reveal the hidden secrets of the Crucible, fighting against other Archons through unique card decks, each filled with parts of the myriad planets and civilizations that exist in this world. By making clever use of the creature cards, artifacts and skills, you can trump your opponent, collect Æmber and use it to craft keys to reveal the secrets. The first Archon to make 3 keys wins the game!