Hammerhead Shark 
Creature — Shark
$0.17 #25078 0.07 28.5 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.
Armored Galleon100%
$1.07↑#299210.52↑28.2 years
"This creature can't attack unless defending player controls an Island."
Steam Frigate100%
$0.24↑#30672↓0.0628.2 years
"This creature can't attack unless defending player controls an Island."
Deep-Sea Serpent100%
$0.35↑#30402↓0.0029.3 years
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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↑#30986↓0.40↑27.3 years↓
"This creature can't attack unless defending player controls an Island."
Wu Warship100%
$1.97↑#30205↓0.0027.3 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↓#30732↓0.0018.9 years↓
"This creature can't attack unless defending player controls an Island."
Vodalian Serpent98%
$0.19↑#30144↓0.0025.9 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↑#215070.1232.7 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↑#216680.48↑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↓#30897↓0.19↑32.1 years↑
"This creature can't attack unless defending player controls a Mountain."