Submerge 

Instant
$3.29 #4309 0.35 26.7 years
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 similar to Submerge 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.
Chronostutter85%
$0.13↓#30110↓0.07↓12.3 years↓
"Put target creature into its owner's library second from the top."
Isolation at Orthanc85%
$0.16↓#20763↓0.283.3 years↓
"Put target creature into its owner's library second from the top."
Misleading Motes84%
$0.06↓#26849↓0.06↓3.1 years↓
"Target creature's owner puts it on their choice of the top or bottom of their library."
Saprazzan Legate84%
$0.35↓#21301↓0.00↓27.0 years
"If an opponent controls a Mountain and you control an Island, you may cast this spell without paying its mana cost."
Grasp of Phantoms83%
$0.01↓#27208↓0.06↓15.1 years↓
"Put target creature on top of its owner's library."
Vedalken Dismisser83%
$0.06↓#29952↓0.12↓21.2 years↓
"When this creature enters, put target creature on top of its owner's library."
Deepwood Legate82%
$0.10↓#24585↓0.00↓27.0 years
"If an opponent controls a Forest and you control a Swamp, you may cast this spell without paying its mana cost."
Run Aground82%
$0.15↓#26152↓0.00↓9.1 years↓
"Put target artifact or creature on top of its owner's library."
Temporal Eddy81%
$0.10↓#30591↓0.4120.0 years↓
"Put target creature or land on top of its owner's library."
Bury in Books80%
$0.08↓#20988↓0.11↓5.5 years↓
"Put target creature into its owner's library second from the top."
Run Behind79%
$0.09↓#22873↓0.08↓0.5 years↓
"Target creature's owner puts it on their choice of the top or bottom of their library."
Uncharted Voyage79%
$0.08↓#17969↓0.00↓1.9 years↓
"Target creature's owner puts it on their choice of the top or bottom of their library."
Uneasy Partings79%
$0.07↓#24266↓0.13↓0.2 years↓
"Target creature's owner puts it on their choice of the top or bottom of their library."