Deep-Sea Serpent {4}{U}{U}
Creature — Serpent
This creature can't attack unless defending player controls an Island.
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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.
Floodchaser 100%
$0.05#28761
"This creature can't attack unless defending player controls an Island."
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$1.01#29872
"This creature can't attack unless defending player controls an Island."
Vodalian Knights 100%
#29223
"This creature can't attack unless defending player controls an Island."
Hammerhead Shark 100%
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"This creature can't attack unless defending player controls an Island."
Red Cliffs Armada 100%
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"This creature can't attack unless defending player controls an Island."
Merchant Ship 100%
$46.42#28352
"This creature can't attack unless defending player controls an Island."
Kukemssa Serpent 100%
$0.16#28250
"This creature can't attack unless defending player controls an Island."
Giant Shark 100%
$0.31#25385
"This creature can't attack unless defending player controls an Island."
Ethereal Whiskergill 100%
$0.10#30473
"This creature can't attack unless defending player controls an Island."
Serpent of the Endless Sea 100%
$0.31#21050
"This creature can't attack unless defending player controls an Island."
Sealock Monster 100%
$0.08#22356
"This creature can't attack unless defending player controls an Island."
Steam Frigate 100%
$0.22#30336
"This creature can't attack unless defending player controls an Island."