Plane

A Plane is the Magic term for "universe", one of the infinite realities of the multiverse. While planes can be governed by any conceivable set of rules and natural laws, or even indeed inconceivable ones, most planes visited in the storyline are comfortably similar to Earth.

There are infinite planes in the multiverse, separated from each other by the a Planar Void, though that has been called by many names. The inhabitants of most of these planes have no idea that theirs is not the only universe, or indeed the only world -- generally speaking, only planeswalkers know that, and are able to travel intentionally between planes.

As each plane generally has one central, populated world, the entire plane is typically named after it.