Slipstream Eel 
Creature — Fish Beast
$0.06 #26414 0.05 24.0 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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"Cycling , Discard this card: Draw a card."
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"This creature can't attack unless defending player controls an Island."
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