Doubling Cube

Artifact, 2 (2)
{3}, {T}: Double the amount of each type of mana in your mana pool.
The cube's surface is pockmarked with jagged runes that seem to shift when unobserved.
Illus. Mark Tedin

Gatherer Card Rulings [Nov 2009]

• 12/1/2004: Doubling Cube's ability is a mana ability. All untargeted activated abilities that add mana to players' mana pools are mana abilities.
• 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 {W}{W}{B}{5} with no restrictions on it in your mana pool and {U}{U}{U} that can be used only to cast artifact spells, you'll end up with {W}{W}{W}{W}{B}{B}{10}, {U}{U}{U} that can be used only to cast artifact spells, and {U}{U}{U} that can be used for anything.

Format Legality	Legal in Vintage, Legacy, Extended Banned in Standard
Printings (2/17)	Tenth Edition (Rare) Fifth Dawn (Rare)