Dandân {U}{U}
Creature — Fish
This creature can't attack unless defending player controls an Island.
When you control no Islands, sacrifice this creature.
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Cards that do something similar 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.
Manta Ray 100%
$0.14#24423
"When you control no Islands, sacrifice this creature."
+1 more matching line
Vodalian Knights 100%
#29223
"When you control no Islands, sacrifice this creature."
+1 more matching line
Sea Serpent 100%
#28414
"When you control no Islands, sacrifice this creature."
+1 more matching line
Merchant Ship 100%
$46.42#28352
"When you control no Islands, sacrifice this creature."
+1 more matching line
Kukemssa Serpent 100%
$0.16#28250
"When you control no Islands, sacrifice this creature."
+1 more matching line
Giant Shark 100%
$0.31#25385
"When you control no Islands, sacrifice this creature."
+1 more matching line
Pirate Ship 100%
$0.69#21244
"When you control no Islands, sacrifice this creature."
+1 more matching line
Island Fish Jasconius 100%
$0.33#26231
"When you control no Islands, sacrifice this creature."
+1 more matching line
Slipstream Serpent 100%
$0.04#28649
"When you control no Islands, sacrifice this creature."
+1 more matching line
Floodchaser 100%
$0.05#28761
"This creature can't attack unless defending player controls an Island."
Armored Galleon 100%
$1.01#29872
"This creature can't attack unless defending player controls an Island."
Hammerhead Shark 100%
#24873
"This creature can't attack unless defending player controls an Island."
Red Cliffs Armada 100%
#30758
"This creature can't attack unless defending player controls an Island."
Deep-Sea Serpent 100%
$0.33#30165
"This creature can't attack unless defending player controls an Island."