Sea Serpent 
Creature — Serpent
$0.10 #29077 0.44 33.2 years
This creature can't attack unless defending player controls an Island.
When you control no Islands, sacrifice this creature.
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Cards similar to Sea 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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"When you control no Islands, sacrifice this creature."
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"When you control no Islands, sacrifice this creature."
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"When you control no Islands, sacrifice this creature."
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"This creature can't attack unless defending player controls an Island."
Red Cliffs Armada98%
$10.74↑#312190.05↓27.5 years↓
"This creature can't attack unless defending player controls an Island."
Sea Monster98%
$0.05↓#288030.00↓29.0 years↓
"This creature can't attack unless defending player controls an Island."
Wu Warship98%
$1.97↑#304740.12↓27.5 years↓
"This creature can't attack unless defending player controls an Island."
Deep-Sea Serpent98%
$0.39↑#306500.31↓29.5 years↓
"This creature can't attack unless defending player controls an Island."
Armored Galleon98%
$1.07↑#300620.00↓28.3 years↓
"This creature can't attack unless defending player controls an Island."
Hammerhead Shark98%
$0.17↑#253920.00↓28.6 years↓
"This creature can't attack unless defending player controls an Island."
Zhou Yu, Chief Commander98%
$150.00↑#297150.26↓27.5 years↓
"this card can't attack unless defending player controls an Island."
Merchant Ship97%
$42.56↑#287710.12↓32.8 years
"When you control no Islands, sacrifice this creature."
+1 more matching line
Pirate Ship97%
$0.45↑#21999↑0.16↓33.2 years
"When you control no Islands, sacrifice this creature."
+1 more matching line
Ethereal Whiskergill97%
$0.25↑#310620.00↓19.0 years↓
"This creature can't attack unless defending player controls an Island."
Island Fish Jasconius96%
$0.32↑#269030.00↓32.8 years
"When you control no Islands, sacrifice this creature."
+1 more matching line
Giant Shark96%
$0.31↑#260070.00↓32.2 years
"When you control no Islands, sacrifice this creature."
+1 more matching line
Kukemssa Serpent96%
$0.11↑#289480.00↓30.0 years↓
"When you control no Islands, sacrifice this creature."
+1 more matching line
Slipstream Eel96%
$0.06↓#264140.05↓24.0 years↓
"This creature can't attack unless defending player controls an Island."
Vodalian Serpent96%
$0.20↑#303950.25↓26.0 years↓
"This creature can't attack unless defending player controls an Island."