Segovian Leviathan 
Creature — Leviathan
$0.22 #27793 0.25 32.3 years
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
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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.
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"This creature can't attack unless defending player controls an Island."