Grozoth {6}{U}{U}{U}
Creature — Leviathan
Defender (This creature can't attack.)
When this creature enters, you may search your library for any number of cards that have mana value 9, reveal them, put them into your hand, then shuffle.
{4}: This creature loses defender until end of turn.
Transmute {1}{U}{U} ({1}{U}{U}, Discard this card: Search your library for a card with the same mana value as this card, reveal it, put it into your hand, then shuffle. Transmute only as a sorcery.)
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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.
Tidewater Minion 100%
$0.16#19765
"{4}: This creature loses defender until end of turn."
+1 more matching line
Glittering Lynx 85%
$0.18#22546
"{2}: Until end of turn, this creature loses "Prevent all damage that would be dealt to this creature." Any player may activate this ability."
Glittering Lion 84%
$0.22#26601
"{3}: Until end of turn, this creature loses "Prevent all damage that would be dealt to this creature." Any player may activate this ability."
Nullhide Ferox 83%
$0.25#23498
"{2}: This creature loses all abilities until end of turn. Any player may activate this ability."