Giant Koi {4}{U}{U}
Creature — Fish
Waterbend {3}: This creature can't be blocked this turn. (While paying a waterbend cost, you can tap your artifacts and creatures to help. Each one pays for {1}.)
Islandcycling {2} ({2}, Discard this card: Search your library for an Island card, reveal it, put it into your hand, then shuffle.)
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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.
Ruinous Waterbending 82%
$0.20#16543
"As an additional cost to cast this spell, you may waterbend {4}."
Spirit Water Revival 82%
$0.86#3883
"As an additional cost to cast this spell, you may waterbend {6}."
Secret of Bloodbending 81%
$1.11#8251
"As an additional cost to cast this spell, you may waterbend {10}."
Katara, Seeking Revenge 81%
$0.17#22175
"As an additional cost to cast this spell, you may waterbend {2}."