Hammerhead Shark 
Creature — Shark
$0.17 #25392 0.00 28.6 years
This creature can't attack unless defending player controls an Island.
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Cards similar to Hammerhead Shark 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.
Steam Frigate100%
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Red Cliffs Armada100%
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Sea Monster100%
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$1.97↑#30474↓0.12↑27.5 years↓
"This creature can't attack unless defending player controls an Island."
Deep-Sea Serpent100%
$0.39↑#30650↓0.31↑29.5 years
"This creature can't attack unless defending player controls an Island."
Armored Galleon100%
$1.07↑#300620.0028.3 years
"This creature can't attack unless defending player controls an Island."
Zhou Yu, Chief Commander100%
$150.00↑#297150.26↑27.5 years↓
"this card can't attack unless defending player controls an Island."
Ethereal Whiskergill100%
$0.25↑#31062↓0.0019.0 years↓
"This creature can't attack unless defending player controls an Island."
Slipstream Eel98%
$0.06↓#264140.0524.0 years↓
"This creature can't attack unless defending player controls an Island."
Vodalian Serpent98%
$0.20↑#303950.25↑26.0 years↓
"This creature can't attack unless defending player controls an Island."
Sea Serpent98%
$0.10↓#290770.44↑33.2 years↑
"This creature can't attack unless defending player controls an Island."
Manta Ray97%
$0.15↓#250540.0029.4 years
"This creature can't attack unless defending player controls an Island."
Slipstream Serpent96%
$0.04↓#293620.12↑20.0 years↓
"This creature can't attack unless defending player controls an Island."
Dandân96%
$1.34↑#217840.33↑32.8 years↑
"This creature can't attack unless defending player controls an Island."
Vodalian Knights96%
$1.01↑#299280.0732.0 years↑
"This creature can't attack unless defending player controls an Island."
Pirate Ship95%
$0.45↑#219990.16↑33.2 years↑
"This creature can't attack unless defending player controls an Island."
Floodchaser94%
$0.10↓#295200.0018.7 years↓
"This creature can't attack unless defending player controls an Island."
Merchant Ship94%
$42.56↑#287710.12↑32.8 years↑
"This creature can't attack unless defending player controls an Island."
Island Fish Jasconius94%
$0.32↑#269030.0032.8 years↑
"This creature can't attack unless defending player controls an Island."
Goblin Rock Sled94%
$0.07↓#31164↓0.0032.2 years↑
"This creature can't attack unless defending player controls a Mountain."