Rune Snag 

Instant
Counter target spell unless its controller pays {2} plus an additional {2} for each card named Rune Snag in each graveyard.
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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.
Don't Make a Sound 95%
$0.12#5992
"Counter target spell unless its controller pays {2}. If they do, surveil 2."
Divert Disaster 94%
$0.20#7831
"Counter target spell unless its controller pays {2}. If they do, you create a Lander token."
Dazzling Denial 93%
$0.22#4118
"Counter target spell unless its controller pays {2}. If you control a Bird, counter that spell unless its controller pays {4} instead."
Dispelling Exhale 93%
$0.19#9129
"Counter target spell unless its controller pays {2}. If a Dragon was beheld, counter that spell unless its controller pays {4} instead."
Rethink 92%
$0.14#22718
"Counter target spell unless its controller pays {X}, where X is its mana value."
We Say Thee Nay! 92%
$0.25#17249
"Counter target spell unless its controller pays {2}. Counter that spell unless its controller pays {4} instead if this spell was cast using teamwork."
Thassa's Rebuff 92%
$0.21#14837
"Counter target spell unless its controller pays {X}, where X is your devotion to blue."