Mirror Box 
Artifact
$5.26 #1699 0.37 4.5 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?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
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"This creature gets +1/+1 for each other creature named this card you control."
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"Legendary creatures you control get +X/+X, where X is the number of legendary creatures you control."