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Mirror Box

Artifact

The "legend rule" doesn't apply to permanents you control.
Each legendary creature you control gets +1/+1.
Each nontoken creature you control gets +1/+1 for each other creature you control with the same name as that creature.

CMC
3
Mana cost
{3}
Color identity
C
Rarity
rare
Set
Kamigawa: Neon Dynasty
Price
$4.63
EDHREC rank
#1684
Buy on TCGplayer
Mirror Box card art
Mirror Box lets you ignore the legend rule for every permanent you control — stack copies of Gisela, Blade of Goldnight, flood the board with legendary tokens, whatever you need — for three mana with no ongoing cost. Deadpool, Trading Card decks run it in over 63% of builds because the card literally enables the commander's core loop, and that inclusion rate is the clearest signal of what Mirror Box is actually worth.

Best Commanders

Commanders with the highest synergy

01
Deadpool, Trading Card

Deadpool, Trading Card

63.6% of decks · synergy 0.60

Deadpool, Trading Card makes copies of itself as part of its damage-dealing engine, and Mirror Box is what keeps those copies alive — without it, the legend rule kills every duplicate the moment it enters. At 63% inclusion across 15,000+ decks, Mirror Box is essentially a functional piece of the deck, not an optional upgrade.

02
The Master, Multiplied

The Master, Multiplied

47.6% of decks · synergy 0.44

The Master, Multiplied wants a board full of identical legendary creatures, and the legend rule shuts that plan down without Mirror Box in play. Mirror Box converts what would be a self-defeating gimmick into a genuine threat, which is why nearly half of all Master decks include it.

03
Cynette, Jelly Drover

Cynette, Jelly Drover

39.5% of decks · synergy 0.37

Cynette, Jelly Drover generates Food token copies of creatures, and Mirror Box ensures that legendary creatures you copy stick around instead of forcing immediate sacrifices. It's the difference between a value engine and a board that collapses under its own legend-rule overhead.

04
Esix, Fractal Bloom

Esix, Fractal Bloom

35.1% of decks · synergy 0.32

Esix, Fractal Bloom turns every token you make into a copy of any creature on the battlefield — hit a legendary, and Mirror Box is what lets you keep all of them. The 35% inclusion rate reflects how often Esix lists are targeting legends as the copy target of choice.

05
Sakashima of a Thousand FacesVial Smasher the Fierce

Sakashima of a Thousand Faces // Vial Smasher the Fierce

32.3% of decks · synergy 0.31

Sakashima of a Thousand Faces already suppresses the legend rule for creatures you control, but Mirror Box extends that protection to all permanents and stacks with Sakashima for redundancy. Pairing it with Vial Smasher the Fierce means copy-heavy strategies get both a damage rider and insurance against losing their board to legend-rule cleanup.

Format Analysis

Where it lives, where it can’t

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

Mirror Box is legal in Commander, Legacy, Modern, Pioneer, Vintage, and Oathbreaker, but Commander is where it actually sees play. Competitive non-rotating formats have no real use for it — the legend rule rarely creates the kind of sustained board-state problem that warrants a three-mana artifact in Legacy or Vintage. Pioneer and Modern theoretically support it, but no serious archetype there is trying to maintain multiple legends at once rather than just winning faster. Commander is the only format where Mirror Box does real work, specifically in decks built around token-copying commanders or legendary tribal strategies.

Key Combos

Combo lines featuring this card

Price Context

Current price

$4.63 cheap tier

At $4.63, Mirror Box sits in the cheap tier — affordable enough to include without a second thought if your commander wants it. It's a narrow card with a very high inclusion rate in the decks that need it, so the price is stable rather than likely to spike or crash.

Explore

Sources

Mentioned

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