Oath of the Gatewatch

Four planeswalkers (Gideon JuraJace BelerenChandra Nalaar and Nissa Revane) join forces in their battle against the Eldrazi titans Ulamog and Kozilek and the demonic planeswalker Ob Nixilis. They become the Gatewatch, a team with a lasting commitment to protect the people of the Multiverse from threats that no one else can handle.