Disrupting Shoal {X}{U}{U}
Instant — Arcane
You may exile a blue card with mana value X from your hand rather than pay this spell's mana cost.
Counter target spell if its mana value is X.
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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.
Sickening Shoal 89%
$13.02#19013
"You may exile a black card with mana value X from your hand rather than pay this spell's mana cost."
Shining Shoal 85%
$1.85#22495
"You may exile a white card with mana value X from your hand rather than pay this spell's mana cost."
Blazing Shoal 84%
$5.40#14321
"You may exile a red card with mana value X from your hand rather than pay this spell's mana cost."
Nourishing Shoal 81%
$0.59#22403
"You may exile a green card with mana value X from your hand rather than pay this spell's mana cost."
Snapback 80%
$0.44#4827
"You may exile a blue card from your hand rather than pay this spell's mana cost."