Doubling Cube is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
01
Official card text
,
: Double the amount of each type of unspent mana you have.
How it works : Doubling Cube
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
Doubling Cube's ability is a mana ability.
No other card is named in this ruling.
- #2· Wizards of the Coast
The "type" of mana is its color, or lack thereof (if the mana is colorless).
No other card is named in this ruling.
- #3· Wizards of the Coast
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.No other card is named in this ruling.
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Popular combos
Real combos played by the community, sorted by popularity.
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#1
Doubling Cube + Voltaic Key + Rings of Brighthearth
Infinite mana permanents you control can produceInfinite untap of artifacts you control
- 1Float
mana in your mana pool. - 2Activate Doubling Cube by paying and tapping it, causing you to add
. - 3Activate Voltaic Key by paying
and tapping it, targeting Doubling Cube. - 4Rings of Brighthearth triggers, causing you to pay
to copy Voltaic Key's ability, targeting Voltaic Key. - 5Resolve both Voltaic Key abilities, untapping Voltaic Key and Doubling Cube.
- 6Repeat from step 2.
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#2
Doubling Cube + Capsize
Infinite artifact ETBInfinite artifact LTBInfinite storm countInfinite blue mana
- 1Float at least
. - 2Cast Doubling Cube by paying .
- 3Activate Doubling Cube by paying and tapping it, doubling the amount of mana in your mana pool. This will result in you adding at least .
- 4Cast Capsize with buyback by paying
, returning Doubling Cube and Capsize to your hand. - 5Repeat from step 2.
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#3
Filigree Sages + Doubling Cube
Infinite untap of artifacts you controlInfinite colored manaInfinite colorless mana
- 1Tap Doubling Cube for to add an additional
. - 2Untap Doubling Cube with Filigree Sages.
- 3You now have an additional floating.
- 4Repeat for infinite mana.
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#4
Urza, Prince of Kroog + Doubling Cube + Swiftfoot Boots
Infinite copies of artifacts you controlInfinite creature tokensInfinite creature ETBInfinite mana permanents you control can produce
- 1Float at least
. - 2Activate Doubling Cube by paying and tapping it, adding at least
. - 3Activate Urza by paying , creating a token copy of Doubling Cube that is a 1/1 Soldier.
- 4Activate Swiftfoot Boots' equip ability by paying , attaching it to the Doubling Cube token.
- 5Repeat from step 2 using the Doubling Cube token instead.
- 6Once you have infinite mana, you may target any artifact you control to get infinite copies of them.
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#5
Karn, the Great Creator + Doubling Cube + Umbral Mantle
Infinitely large creature until end of turnInfinite mana permanents you control can produceInfinite untap of creatures you control
- 1Activate Karn's first loyalty ability by putting a loyalty counter on it, causing Doubling Cube to become an artifact creature until end of turn.
- 2Activate Umbral Mantle's equip ability by paying
, attaching it to Doubling Cube. - 3Float at least in your mana pool.
- 4Activate Doubling Cube by paying and tapping it, adding at least .
- 5Activate Doubling Cube by paying and untapping it, giving it +2/+2 until end of turn.
- 6Repeat from step 4.
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#6
Urza, Prince of Kroog + Doubling Cube + Lightning Greaves
Infinite copies of artifacts you controlInfinite creature tokensInfinite creature ETBInfinite mana permanents you control can produce
- 1Float at least .
- 2Activate Doubling Cube by paying and tapping it, adding at least .
- 3Activate Urza by paying , creating a token copy of Doubling Cube that is a 1/1 Soldier.
- 4Activate Lightning Greaves' equip ability by paying , attaching it to the Doubling Cube token.
- 5Repeat from step 2 using the Doubling Cube token instead.
- 6Once you have infinite mana, you may target any artifact you control to get infinite copies of them.
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#7
Karn, Silver Golem + Doubling Cube + Umbral Mantle
Infinitely large creature until end of turnInfinite mana permanents you control can produceInfinite untap of creatures you control
- 1Activate Karn by paying , causing Doubling Cube to become an artifact creature until end of turn.
- 2Activate Umbral Mantle's equip ability by paying , attaching it to Doubling Cube.
- 3Float at least in your mana pool.
- 4Activate Doubling Cube by paying and tapping it, adding at least .
- 5Activate Doubling Cube by paying and untapping it, giving it +2/+2 until end of turn.
- 6Repeat from step 4.
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#8
Urza, Prince of Kroog + Doubling Cube + Akroma's Memorial
Infinite copies of artifacts you controlInfinite creature ETBInfinite mana permanents you control can produceInfinite creature copies of artifacts you control
- 1Float at least .
- 2Activate Doubling Cube by paying and tapping it, adding at least .
- 3Activate Urza by paying , creating a token copy of Doubling Cube that is a 1/1 Soldier.
- 4Repeat from step 2 using the Doubling Cube token instead.
- 5Once you have infinite mana, you may target any artifact you control to get infinite copies of them.
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Legal formats
modernlegacyvintagepennycommanderoathbreakerduelpredhtlr
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Meta decks with Doubling Cube
No archived Top 8 deck with this card yet.