Wizards of the Coast has published the Magic Maps as basic editions and extensions. Basic editions are generally pre-existing maps; in this case, they are referred to as reissues of maps. Then, each sets extends the game by adding new cards to the basic editions.
Starting with the Ice Age edition, the sets are grouped into blocks of several extensions, each comprising a stand-alone extension of more than 200 maps, followed by two small sets, which generally develop the themes introduced in the stand-alone extension. However, for some time now, only two sets have been introduced per year.