Harbor Serpent 


Creature — Serpent
$0.13 #20672 0.50 16.1 years
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
This creature can't attack unless there are five or more Islands on the battlefield.
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Cards similar to Harbor Serpent 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.
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"This creature can't attack unless defending player controls an Island."
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"This creature can't attack unless defending player controls an Island."
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"this card can't attack unless defending player controls an Island."
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"This creature can't attack unless defending player controls an Island."
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"This creature can't attack unless defending player controls an Island."