Mirror Box 
Artifact
$4.25 #1711 0.42 4.7 years
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.
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Cards similar to Mirror Box expected a card that isn't here?
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"The "legend rule" doesn't apply to creatures you control."
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"Each legendary creature you control gets +1/+1 for each other legendary creature you control."
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"This creature gets +1/+1 for each other creature named this card you control."
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"The "legend rule" doesn't apply to creature tokens you control."
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"Legendary creatures you control get +X/+X, where X is the number of legendary creatures you control."
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"This creature gets +1/+1 for each other creature on the battlefield named this card."