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Doubling Cube

Artifact

{3}, {T}: Double the amount of each type of unspent mana you have.

CMC
2
Mana cost
{2}
Color identity
C
Rarity
rare
Set
Fifth Dawn
Price
$36.18
EDHREC rank
#3455
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Doubling Cube card art
Doubling Cube turns whatever mana you've accumulated into twice as much for three mana and a tap — in big-mana decks, that's not incremental advantage, it's a second main phase that dwarfs the first. Pair it with Voltaic Key to untap it repeatedly, and commanders like Omnath, Locus of Mana that bank mana across turns will convert those doublings into game-ending sums fast.

Best Commanders

Commanders with the highest synergy

01
Omnath, Locus of Mana

Omnath, Locus of Mana

55.8% of decks · synergy 0.54

Omnath, Locus of Mana retains green mana in its mana pool between turns, so Doubling Cube doesn't just accelerate a single turn — it compounds a growing reservoir that Omnath can spend on a massive attack or X-spell.

02
Kruphix, God of Horizons

Kruphix, God of Horizons

52.3% of decks · synergy 0.51

Kruphix, God of Horizons converts unspent mana into colorless mana that persists, which means Doubling Cube is effectively doubling a bank account rather than a single paycheck — the two cards share the same core loop of accumulate-then-explode.

03
Ozai, the Phoenix King

Ozai, the Phoenix King

49.4% of decks · synergy 0.48

Ozai, the Phoenix King wants to build toward enormous red mana sinks, and Doubling Cube lets the deck skip several incremental steps and arrive at game-ending totals in a single activation.

05

Megatron, Tyrant

15.8% of decks · synergy 0.15

Megatron, Tyrant needs colorless mana to fuel its abilities, and Doubling Cube is a reliable accelerant that fits naturally alongside the artifact synergies already present in that shell.

Format Analysis

Where it lives, where it can’t

FormatVerdict
commander legal
legacy legal
modern legal
pioneer not legal
standard not legal
vintage legal
pauper not legal
oathbreaker legal

Doubling Cube is a Commander card, full stop — the format's longer games and larger mana pools are exactly the environment where doubling your mana crosses from cute to decisive. In Legacy and Vintage it's technically legal but never played; those formats end before you can profitably spend the mana the Cube generates, and the three-mana setup cost is a liability. Oathbreaker is a reasonable home if your planeswalker leans on a high-cost ultimate or repeated X-spells, but the power ceiling is lower than in Commander given the smaller starting hand and life total. Anywhere outside those slower formats, Doubling Cube sits on the shelf.

Key Combos

Combo lines featuring this card

419 decks
Doubling CubeCapsize

Doubling CubeCapsize

Infinite storm count; Infinite blue mana; Infinite magecraft triggers; Infinite mana permanents you control can produce; Return any number of permanents to their owner's hand during each of your turns; Lock; Mass Land Denial

View on Commander Spellbook ↗

Budget Alternatives

Cheaper options that do most of the same work

There's no direct budget equivalent that doubles stored mana — that effect is unique to Doubling Cube — but Nyx Lotus and Everflowing Chalice can scale mana production steeply in dedicated big-mana builds for a fraction of the cost, trading the explosive single-activation doubling for slower accumulation. If the goal is raw mana volume rather than the specific doubling trigger, those pieces cover most of the same ground at under $3 combined.

Price Context

Current price

$36.18 premium tier

At $36.18, Doubling Cube sits in premium artifact territory — steep for a single card with no immediate board impact, but it's earned the price tag by being a uniquely irreplaceable effect. It has held value steadily because no other card replicates the doubling mechanic, which keeps demand from the Omnath and Kruphix crowds consistent.

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Sources

Mentioned

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Updated . Data from Scryfall, EDHREC, and Commander Spellbook.