Doubling Cube | Magic: The Gathering
Formats Doubling Cube is Legal in
Official Oracle Text for Doubling Cube
Official Rulings for Doubling Cube
12/1/2004 : The "type" of mana is its color, or lack thereof (if the mana is colorless).
12/1/2004 : Any restrictions on the mana in your mana pool aren't copied. For example, if you have with no restrictions on it in your mana pool and that can be used only to cast artifact spells, you'll end up with , that can be used only to cast artifact spells, and that can be used for anything.