Single cards
Dragon's Maze

Real Zarek from the Izzet Guild finds the Labyrinth. Ancient scrolls of the Azorious guild explains that the Labyrinth is caused by the fall of the guild pact during the dissension. Niv Mizzet, master of the Izzet guild. decides that each guilds has to send a champion to the Labyrinth in order to decide which guild will keep the codex.