Cacophony Unleashed 
Enchantment
$0.98 #6841 0.15 3.1 years
When this enchantment enters, if you cast it, destroy all nonenchantment creatures.
Whenever this enchantment or another enchantment you control enters, until end of turn, this enchantment becomes a legendary 6/6 Nightmare God creature with menace and deathtouch. It's still an enchantment.
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Cards similar to Cacophony Unleashed 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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"Destroy all nonenchantment creatures."
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"When this creature enters, if you cast it from your hand, destroy all creatures your opponents control, then tap all other creatures you control."