Green Sun's Zenith 
Sorcery
$30.81 #540 0.85 15.7 years
Search your library for a green creature card with mana value X or less, put it onto the battlefield, then shuffle. Shuffle Green Sun's Zenith into its owner's library.
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Cards similar to Green Sun's Zenith 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.
Woodland Bellower90%
$4.58↓#6354↓0.39↓11.3 years↓
"When this creature enters, you may search your library for a nonlegendary green creature card with mana value 3 or less, put it onto the battlefield, then shuffle."
Natural Order89%
$14.60↓#1534↓1.44↑29.7 years↑
"Search your library for a green creature card, put it onto the battlefield, then shuffle."
Magus of the Order85%
$0.26↓#12649↓0.57↓5.9 years↓
", 
, Sacrifice this creature and another green creature: Search your library for a green creature card, put it onto the battlefield, then shuffle."
, , Sacrifice this creature and another green creature: Search your library for a green creature card, put it onto the battlefield, then shuffle."
Chord of Calling80%
$6.14↓#5190.60↓21.0 years↑
"Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle."
Nature's Rhythm74%
$3.31↓#852↓0.55↓1.5 years↓
"Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle."
Protean Hulk74%
$6.04↓#2571↓1.39↑20.5 years↑
"When this creature dies, search your library for any number of creature cards with total mana value 6 or less, put them onto the battlefield, then shuffle."
Summoner's Pact73%
$3.19↓#2987↓0.73↓19.5 years↑
"Search your library for a green creature card, reveal it, put it into your hand, then shuffle."
Yisan, the Wanderer Bard72%
$0.36↓#8170↓0.69↓12.3 years↓
"
, , Put a verse counter on this card: Search your library for a creature card with mana value equal to the number of verse counters on this card, put it onto the battlefield, then shuffle."
, , Put a verse counter on this card: Search your library for a creature card with mana value equal to the number of verse counters on this card, put it onto the battlefield, then shuffle."
Rocco, Cabaretti Caterer71%
$0.20↓#6072↓0.65↓4.5 years↓
"When this card enters, if you cast it, you may search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle."