Stormtide Leviathan {5}{U}{U}{U}
Creature — Leviathan
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
All lands are Islands in addition to their other types.
Creatures without flying or islandwalk can't attack.
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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.
Sandwurm Convergence 82%
$0.35#2271
"Creatures with flying can't attack you or planeswalkers you control."
Undertow 81%
$1.54#31300
"Creatures with islandwalk can be blocked as though they didn't have islandwalk."