
Artifact
,
: Double the amount of each type of unspent mana you have.
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→ Infinite mana artifacts you control can produce, Infinite mana permanents you control can produce, Infinite untap of artifacts you control
→ Infinite storm count, Infinite blue mana, Infinite magecraft triggers
→ Infinite untap of artifacts you control, Infinite colored mana, Infinite colorless mana
→ Infinite copies of artifacts you control, Infinite creature tokens, Infinite ETB
→ Infinitely large creature until end of turn, Infinite mana permanents you control can produce, Infinite untap of creatures you control
→ Infinite copies of artifacts you control, Infinite creature tokens, Infinite ETB
Doubling Cube's ability is a mana ability.
The "type" of mana is its color, or lack thereof (if the mana is colorless).
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.