Shining Shoal {X}{W}{W}
Instant — Arcane
You may exile a white card with mana value X from your hand rather than pay this spell's mana cost.
The next X damage that a source of your choice would deal to you and/or creatures you control this turn is dealt to any target 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.
Disrupting Shoal 85%
$14.41#10650
"You may exile a blue card with mana value X from your hand rather than pay this spell's mana cost."
Sickening Shoal 84%
$13.02#19013
"You may exile a black card with mana value X from your hand rather than pay this spell's mana cost."
Blazing Shoal 80%
$5.40#14321
"You may exile a red card with mana value X from your hand rather than pay this spell's mana cost."
Scars of the Veteran 80%
#26689
"You may exile a white card from your hand rather than pay this spell's mana cost."
Reverent Mantra 80%
$21.38#14462
"You may exile a white card from your hand rather than pay this spell's mana cost."