Serpent of the Endless Sea 
Creature — Serpent
$0.28 #21642 0.33 17.1 years
Serpent of the Endless Sea's power and toughness are each equal to the number of Islands you control.
This creature can't attack unless defending player controls an Island.
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Cards similar to Serpent of the Endless Sea 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 Galleon92%
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"This creature can't attack unless defending player controls an Island."
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"This creature can't attack unless defending player controls an Island."
Deep-Sea Serpent92%
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"This creature can't attack unless defending player controls an Island."
Sea Monster92%
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"This creature can't attack unless defending player controls an Island."
Red Cliffs Armada92%
$11.26↑#30986↓0.4027.3 years↑
"This creature can't attack unless defending player controls an Island."
Hammerhead Shark92%
$0.17↓#250780.07↓28.5 years↑
"This creature can't attack unless defending player controls an Island."
Wu Warship92%
$1.97↑#30205↓0.00↓27.3 years↑
"This creature can't attack unless defending player controls an Island."
Zhou Yu, Chief Commander92%
$150.00↑#29454↓0.2727.3 years↑
"this card can't attack unless defending player controls an Island."
Ethereal Whiskergill92%
$0.11↓#30732↓0.00↓18.9 years↑
"This creature can't attack unless defending player controls an Island."
Dreamwinder90%
$0.10↓#29950↓0.3524.9 years↑
"This creature can't attack unless defending player controls an Island."
Vodalian Serpent90%
$0.19↓#30144↓0.00↓25.9 years↑
"This creature can't attack unless defending player controls an Island."
Slipstream Eel88%
$0.06↓#26052↓0.21↓23.9 years↑
"This creature can't attack unless defending player controls an Island."
Sea Serpent88%
$0.09↓#28803↓0.2433.1 years↑
"This creature can't attack unless defending player controls an Island."
+1 more matching line
Kukemssa Serpent88%
$0.11↓#28620↓0.47↑29.9 years↑
"This creature can't attack unless defending player controls an Island."
+1 more matching line
Manta Ray88%
$0.13↓#247400.07↓29.2 years↑
"This creature can't attack unless defending player controls an Island."
+1 more matching line
Slipstream Serpent87%
$0.04↓#29080↓0.17↓19.9 years↑
"This creature can't attack unless defending player controls an Island."
+1 more matching line
Goblin Rock Sled86%
$0.07↓#30897↓0.19↓32.1 years↑
"This creature can't attack unless defending player controls a Mountain."
Dandân86%
$1.96↑#215070.12↓32.7 years↑
"This creature can't attack unless defending player controls an Island."
+1 more matching line
Molimo, Maro-Sorcerer85%
$0.17↓#11743↑0.3325.9 years↑
"this card's power and toughness are each equal to the number of lands you control."
Mirkwood Pathmaker85%
$0.20↓#183000.00↓0.1 years↓
"this card's power and toughness are each equal to the number of lands you control."