Unravel 
Instant
$0.18 #14001 0.11 1.1 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.
Nix88%
$0.97↑#25501↓0.24↑19.3 years↑
"Counter target spell if no mana was spent to cast it."
Dream Fracture74%
$0.15↓#4379↑0.25↑18.1 years↑
"Counter target spell. Its controller draws a card."
Clockwork Servant72%
$0.06↓#23093↓0.29↑6.9 years↑
"When this creature enters, if at least three mana of the same color was spent to cast it, draw a card."
Contradict72%
$0.06↓#19487↓0.00↓11.4 years↑
"Counter target spell."
Minor Misstep72%
$0.17↓#147201.00↑3.6 years↑
"Counter target spell with mana value 1 or less."
Thoughtbind72%
$0.05↓#29397↓0.33↑21.9 years↑
"Counter target spell with mana value 4 or less."
Vex71%
$0.06↓#24571↓0.30↑22.6 years↑
"Counter target spell. That spell's controller may draw a card."