Engulf the Shore {3}{U}
Instant
Return to their owners' hands all creatures with toughness less than or equal to the number of Islands you control.
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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.
Whelming Wave 83%
$1.02#2292
"Return all creatures to their owners' hands except for Krakens, Leviathans, Octopuses, and Serpents."