Dragonskull Summit | Magic: The Gathering
Formats Dragonskull Summit is Legal in
Official Oracle Text for Dragonskull Summit
: Add or to your mana pool.
Official Rulings for Dragonskull Summit
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).