Doubling Cube #116
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Card Details
, 
: Double the amount of each type of unspent mana you have.
“The cube's surface is pockmarked with jagged runes that seem to shift when unobserved.”
Illustrated by Mark Tedin
Rulings (3)
Dec 1, 2004
Any restrictions on the unspent mana aren't copied. For example, if you have 
with no restrictions on it 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.
Dec 1, 2004
Doubling Cube's ability is a mana ability.
Dec 1, 2004
The "type" of mana is its color, or lack thereof (if the mana is colorless).
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