Glacial Fortress | Magic: The Gathering
Formats Glacial Fortress is Legal in
Official Oracle Text for Glacial Fortress
: Add or to your mana pool.
Official Rulings for Glacial Fortress
10/1/2009 : As this is entering the battlefield, it checks for lands that are already on the battlefield. It won't see lands that are entering the battlefield at the same time (due to Warp World, for example).