Serpent of the Endless Sea 
Creature — Serpent
$0.29 #22028 0.24 17.3 years
Serpent of the Endless Sea's power and toughness are each equal to the number of Islands you control.
This creature can't attack unless defending player controls an Island.
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Cards similar to Serpent of the Endless Sea 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 card's power and toughness are each equal to the number of lands you control."
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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's power and toughness are each equal to the number of lands you control."
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"This creature can't attack unless defending player controls an Island."
+1 more matching line
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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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