Deep-Sea Serpent 
Creature — Serpent
$0.35 #30402 0.00 29.3 years
This creature can't attack unless defending player controls an Island.
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Cards similar to Deep-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.
Armored Galleon100%
$1.07↑#299210.52↑28.2 years↓
"This creature can't attack unless defending player controls an Island."
Steam Frigate100%
$0.24↓#306720.0628.2 years↓
"This creature can't attack unless defending player controls an Island."
Sea Monster100%
$0.03↓#285350.25↑28.9 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↓#250780.0728.5 years
"This creature can't attack unless defending player controls an Island."
Wu Warship100%
$1.97↑#302050.0027.3 years↓
"This creature can't attack unless defending player controls an Island."
Zhou Yu, Chief Commander100%
$150.00↑#294540.27↑27.3 years↓
"this card can't attack unless defending player controls an Island."
Ethereal Whiskergill100%
$0.11↓#307320.0018.9 years↓
"This creature can't attack unless defending player controls an Island."
Vodalian Serpent98%
$0.19↓#301440.0025.9 years↓
"This creature can't attack unless defending player controls an Island."
Sea Serpent98%
$0.09↓#288030.24↑33.1 years↑
"This creature can't attack unless defending player controls an Island."
Slipstream Eel98%
$0.06↓#260520.21↑23.9 years↓
"This creature can't attack unless defending player controls an Island."
Manta Ray97%
$0.13↓#247400.0729.2 years
"This creature can't attack unless defending player controls an Island."
Slipstream Serpent97%
$0.04↓#290800.17↑19.9 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↑#296140.24↑31.8 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↓#308970.19↑32.1 years↑
"This creature can't attack unless defending player controls a Mountain."