Metamorphic Alteration 
Enchantment — Aura
$0.36 #14553 0.27 8.1 years
Enchant creature
As this Aura enters, choose a creature.
Enchanted creature is a copy of the chosen creature.
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Cards similar to Metamorphic Alteration 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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"Enchant creature"