Dandân 

Creature — Fish
$1.34 #21784 0.33 32.8 years
This creature can't attack unless defending player controls an Island.
When you control no Islands, sacrifice this creature.
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Cards similar to Dandân 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.
Sea Serpent98%
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"When you control no Islands, sacrifice this creature."
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Manta Ray98%
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"When you control no Islands, sacrifice this creature."
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"When you control no Islands, sacrifice this creature."
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Vodalian Knights96%
$1.01↓#29928↓0.07↓32.0 years
"When you control no Islands, sacrifice this creature."
+1 more matching line
Pirate Ship96%
$0.45↓#219990.16↓33.2 years
"When you control no Islands, sacrifice this creature."
+1 more matching line
Sea Monster96%
$0.05↓#28803↓0.00↓29.0 years↓
"This creature can't attack unless defending player controls an Island."
Wu Warship96%
$1.97↑#30474↓0.12↓27.5 years↓
"This creature can't attack unless defending player controls an Island."
Steam Frigate96%
$0.25↓#31015↓0.61↑28.3 years↓
"This creature can't attack unless defending player controls an Island."
Red Cliffs Armada96%
$10.74↑#31219↓0.05↓27.5 years↓
"This creature can't attack unless defending player controls an Island."
Hammerhead Shark96%
$0.17↓#253920.00↓28.6 years↓
"This creature can't attack unless defending player controls an Island."
Deep-Sea Serpent96%
$0.39↓#30650↓0.3129.5 years↓
"This creature can't attack unless defending player controls an Island."
Armored Galleon96%
$1.07↓#30062↓0.00↓28.3 years↓
"This creature can't attack unless defending player controls an Island."
Zhou Yu, Chief Commander96%
$150.00↑#29715↓0.2627.5 years↓
"this card can't attack unless defending player controls an Island."
Island Fish Jasconius96%
$0.32↓#26903↓0.00↓32.8 years
"When you control no Islands, sacrifice this creature."
+1 more matching line
Merchant Ship96%
$42.56↑#28771↓0.12↓32.8 years
"When you control no Islands, sacrifice this creature."
+1 more matching line
Ethereal Whiskergill96%
$0.25↓#31062↓0.00↓19.0 years↓
"This creature can't attack unless defending player controls an Island."
Giant Shark95%
$0.31↓#260070.00↓32.2 years
"When you control no Islands, sacrifice this creature."
+1 more matching line
Kukemssa Serpent94%
$0.11↓#28948↓0.00↓30.0 years↓
"When you control no Islands, sacrifice this creature."
+1 more matching line
Vodalian Serpent93%
$0.20↓#30395↓0.2526.0 years↓
"This creature can't attack unless defending player controls an Island."