Crashing Wave {U}{U}
Sorcery
As an additional cost to cast this spell, waterbend {X}. (While paying a waterbend cost, you can tap your artifacts and creatures to help. Each one pays for {1}.)
Tap up to X target creatures, then distribute three stun counters among any number of tapped creatures your opponents control. (If a permanent with a stun counter would become untapped, remove one from it instead.)
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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.
Waterbender's Restoration 100%
$3.73#6707
"As an additional cost to cast this spell, waterbend {X}."
Secret of Bloodbending 97%
$1.11#8251
"As an additional cost to cast this spell, you may waterbend {10}."
Ruinous Waterbending 96%
$0.20#16543
"As an additional cost to cast this spell, you may waterbend {4}."
Spirit Water Revival 96%
$0.86#3883
"As an additional cost to cast this spell, you may waterbend {6}."
Katara, Seeking Revenge 96%
$0.17#22175
"As an additional cost to cast this spell, you may waterbend {2}."
Out Cold 84%
$0.23#13613
"Tap up to two target creatures and put a stun counter on each of them. Investigate."