Submerge {4}{U}
Instant
If an opponent controls a Forest and you control an Island, you may cast this spell without paying its mana cost.
Put target creature on top of its owner's library.
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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.
Rushwood Legate 97%
$0.27#29487
"If an opponent controls an Island and you control a Forest, you may cast this spell without paying its mana cost."
Deepwood Legate 85%
$0.16#23900
"If an opponent controls a Forest and you control a Swamp, you may cast this spell without paying its mana cost."
Refreshing Rain 81%
$0.22#27430
"If an opponent controls a Swamp and you control a Forest, you may cast this spell without paying its mana cost."
Ether Well 96%
$0.23#28546
"Put target creature on top of its owner's library. If that creature is red, you may put it on the bottom of its owner's library instead."
Isolation at Orthanc 83%
$0.09#20386
"Put target creature into its owner's library second from the top."