Sea Serpent 
Creature — Serpent
$0.09 #28803 0.24 33.1 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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"This creature can't attack unless defending player controls an Island."
Steam Frigate98%
$0.24↑#306720.06↓28.2 years↓
"This creature can't attack unless defending player controls an Island."
Deep-Sea Serpent98%
$0.35↑#304020.00↓29.3 years↓
"This creature can't attack unless defending player controls an Island."
Sea Monster98%
$0.03↓#285350.2528.9 years↓
"This creature can't attack unless defending player controls an Island."
Red Cliffs Armada98%
$11.26↑#309860.40↑27.3 years↓
"This creature can't attack unless defending player controls an Island."
Hammerhead Shark98%
$0.17↑#250780.07↓28.5 years↓
"This creature can't attack unless defending player controls an Island."
Wu Warship98%
$1.97↑#302050.00↓27.3 years↓
"This creature can't attack unless defending player controls an Island."
Zhou Yu, Chief Commander98%
$150.00↑#294540.2727.3 years↓
"this card can't attack unless defending player controls an Island."
Pirate Ship97%
$0.50↑#21668↑0.48↑33.1 years
"When you control no Islands, sacrifice this creature."
+1 more matching line
Merchant Ship97%
$43.78↑#285440.42↑32.7 years
"When you control no Islands, sacrifice this creature."
+1 more matching line
Ethereal Whiskergill97%
$0.11↑#307320.00↓18.9 years↓
"This creature can't attack unless defending player controls an Island."
Island Fish Jasconius96%
$0.32↑#265710.42↑32.7 years
"When you control no Islands, sacrifice this creature."
+1 more matching line
Giant Shark96%
$0.29↑#256310.3032.1 years
"When you control no Islands, sacrifice this creature."
+1 more matching line
Vodalian Serpent96%
$0.19↑#301440.00↓25.9 years↓
"This creature can't attack unless defending player controls an Island."
Kukemssa Serpent96%
$0.11↑#286200.47↑29.9 years↓
"When you control no Islands, sacrifice this creature."
+1 more matching line
Slipstream Eel96%
$0.06↓#260520.2123.9 years↓
"This creature can't attack unless defending player controls an Island."