Nature's Rhythm {X}{G}{G}
Sorcery
Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle.
Harmonize {X}{G}{G}{G}{G} (You may cast this card from your graveyard for its harmonize cost. You may tap a creature you control to reduce that cost by an amount of generic mana equal to its power. Then exile this spell.)
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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.
Chord of Calling 100%
$6.35#528
"Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle."
Green Sun's Zenith 91%
$28.51#549
"Search your library for a green creature card with mana value X or less, put it onto the battlefield, then shuffle. Shuffle this card into its owner's library."
Eldritch Evolution 90%
$3.90#728
"Search your library for a creature card with mana value X or less, where X is 2 plus the sacrificed creature's mana value. Put that card onto the battlefield, then shuffle. Exile this card."
Celestial Reunion 86%
$0.81#10226
"Search your library for a creature card with mana value X or less, reveal it, put it into your hand, then shuffle. If this spell's additional cost was paid and the revealed card is the chosen type, put that card onto the battlefield instead of putting it into your hand."