Scourge of Fleets 
Creature — Kraken
$0.49 #2183 0.49 12.4 years
When this creature enters, return each creature your opponents control with toughness X or less to its owner's hand, where X is the number of Islands you control.
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Cards similar to Scourge of Fleets 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.
Spectral Deluge94%
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"Return each creature your opponents control with toughness X or less to its owner's hand, where X is the number of Islands you control."
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"Return to their owners' hands all creatures with toughness less than or equal to the number of Islands you control."
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"When this creature exploits a creature, return to their owners' hands all creatures your opponents control with toughness less than the exploited creature's toughness."
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"When this creature enters, if you control two or more Islands, you may return target tapped creature to its owner's hand."
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"Whenever this creature attacks, you may return target creature defending player controls with toughness 2 or less to its owner's hand."