Sea Monster 
Creature — Serpent
$0.03 #28535 0.25 28.9 years
This creature can't attack unless defending player controls an Island.
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Cards similar to Sea Monster 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.
Armored Galleon100%
$1.07↑#299210.52↑28.2 years
"This creature can't attack unless defending player controls an Island."
Steam Frigate100%
$0.24↑#306720.06↓28.2 years
"This creature can't attack unless defending player controls an Island."
Deep-Sea Serpent100%
$0.35↑#304020.00↓29.3 years
"This creature can't attack unless defending player controls an Island."
Red Cliffs Armada100%
$11.26↑#309860.40↑27.3 years↓
"This creature can't attack unless defending player controls an Island."
Hammerhead Shark100%
$0.17↑#250780.07↓28.5 years
"This creature can't attack unless defending player controls an Island."
Wu Warship100%
$1.97↑#302050.00↓27.3 years↓
"This creature can't attack unless defending player controls an Island."
Zhou Yu, Chief Commander100%
$150.00↑#294540.2727.3 years↓
"this card can't attack unless defending player controls an Island."
Ethereal Whiskergill100%
$0.11↑#307320.00↓18.9 years↓
"This creature can't attack unless defending player controls an Island."
Vodalian Serpent98%
$0.19↑#301440.00↓25.9 years↓
"This creature can't attack unless defending player controls an Island."
Sea Serpent98%
$0.09↑#288030.2433.1 years↑
"This creature can't attack unless defending player controls an Island."
Slipstream Eel98%
$0.06↑#260520.2123.9 years↓
"This creature can't attack unless defending player controls an Island."
Manta Ray97%
$0.13↑#247400.07↓29.2 years
"This creature can't attack unless defending player controls an Island."
Slipstream Serpent97%
$0.04↑#290800.1719.9 years↓
"This creature can't attack unless defending player controls an Island."
Dandân96%
$1.96↑#21507↑0.12↓32.7 years↑
"This creature can't attack unless defending player controls an Island."
Vodalian Knights96%
$1.01↑#296140.2431.8 years↑
"This creature can't attack unless defending player controls an Island."
Pirate Ship95%
$0.50↑#21668↑0.48↑33.1 years↑
"This creature can't attack unless defending player controls an Island."
Floodchaser94%
$0.09↑#292820.59↑18.6 years↓
"This creature can't attack unless defending player controls an Island."
Merchant Ship94%
$43.78↑#285440.42↑32.7 years↑
"This creature can't attack unless defending player controls an Island."
Island Fish Jasconius94%
$0.32↑#265710.42↑32.7 years↑
"This creature can't attack unless defending player controls an Island."
Goblin Rock Sled94%
$0.07↑#308970.1932.1 years↑
"This creature can't attack unless defending player controls a Mountain."