Mirage Mirror {3}
Artifact
{2}: This artifact becomes a copy of target artifact, creature, enchantment, or land until end of turn.
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Cards that do something similar 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.
Mizzium Transreliquat 84%
$0.46#23352
"{3}: This artifact becomes a copy of target artifact until end of turn."