Not legal in Pauper, Alchemy, Pauper Commander, Premodern, Pre-EDH, Old School
Notes & Rules Information
If one of these lands enters the battlefield at the same time as one or more other lands (due to Oblivion Sower or Warp World, perhaps), it doesn't take those lands into consideration when determining how many other lands you control.
(2016-09-20)
If one of these lands is your first, second, or third land, it enters the battlefield untapped. If you control three or more other lands, however, it enters the battlefield tapped.
: Add 
or 
.