Unravel 


Instant
$0.15 #13832 0.12 1.2 years
Counter target spell. If the amount of mana spent to cast that spell was less than its mana value, you draw a card.
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Cards similar to Unravel 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.
Clockwork Servant72%
$0.05↓#23446↓0.00↓7.0 years↑
"When this creature enters, if at least three mana of the same color was spent to cast it, draw a card."