Combust 
Instant
$0.09 #24189 0.12 16.3 years
This spell can't be countered.
Combust deals 5 damage to target white or blue creature. The damage can't be prevented.
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Cards similar to Combust 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.
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"This spell can't be countered."