Mm'menon, the Right Hand {3}{U}{U}
Legendary Creature — Jellyfish Advisor
Flying
You may look at the top card of your library any time.
You may cast artifact spells from the top of your library.
Artifacts you control have "{T}: Add {U}. Spend this mana only to cast a spell from anywhere other than your hand."
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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.
Mystic Forge 84%
$2.97#414
"You may cast artifact spells and colorless spells from the top of your library."
+1 more matching line
Lens of Clarity 86%
$0.07#19422
"You may look at the top card of your library and at face-down creatures you don't control any time."
Reason // Believe 85%
$0.23#14979
"Look at the top card of your library. You may put it onto the battlefield if it's a creature card. If you don't, put it into your hand."