Slipstream Eel 
Creature — Fish Beast
$0.06 #26052 0.21 23.9 years
This creature can't attack unless defending player controls an Island.
Cycling 
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Cards similar to Slipstream Eel 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.
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"This creature can't attack unless defending player controls an Island."
Slipstream Serpent96%
$0.04↓#290800.1719.9 years↓
"This creature can't attack unless defending player controls an Island."
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$0.09↑#288030.2433.1 years↑
"This creature can't attack unless defending player controls an Island."
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$0.13↑#247400.07↓29.2 years↑
"This creature can't attack unless defending player controls an Island."
River Serpent94%
$0.15↑#18943↑0.189.4 years↓
"Cycling , Discard this card: Draw a card."
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Dandân93%
$1.96↑#215070.1232.7 years↑
"This creature can't attack unless defending player controls an Island."
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$1.01↑#296140.2431.8 years↑
"This creature can't attack unless defending player controls an Island."
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$0.07↑#308970.1932.1 years↑
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Pirate Ship90%
$0.50↑#216680.48↑33.1 years↑
"This creature can't attack unless defending player controls an Island."
Floodchaser90%
$0.09↑#292820.59↑18.6 years↓
"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."