Slipstream Eel {5}{U}{U}
Creature — Fish Beast
This creature can't attack unless defending player controls an Island.
Cycling {1}{U} ({1}{U}, Discard this card: Draw a card.)
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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.
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."
Vodalian Knights 100%
#29223
"This creature can't attack unless defending player controls an Island."