Rune Snag 

Instant
$0.12 #28556 0.33 20.1 years
Counter target spell unless its controller pays
plus an additional
for each card named Rune Snag in each graveyard.
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Cards similar to Rune Snag 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.
Rakshasa's Disdain92%
$0.05↓#18657↑0.50↑11.6 years↓
"Counter target spell unless its controller pays
for each card in your graveyard."
Countervailing Winds88%
$0.23↑#9055↑0.14↓9.1 years↓
"Counter target spell unless its controller pays
for each card in your graveyard."
Evasive Action87%
$0.23↑#17931↑0.07↓25.3 years↑
"Counter target spell unless its controller pays
for each basic land type among lands you control."
Flip the Switch86%
$0.19↑#12832↑0.05↓4.9 years↓
"Counter target spell unless its controller pays
. Create a 2/2 black Zombie creature token with decayed."
Oppressive Will85%
$0.20↑#242300.13↓21.3 years↑
"Counter target spell unless its controller pays
for each card in your hand."
Circular Logic84%
$0.26↑#7571↑0.3324.6 years↑
"Counter target spell unless its controller pays
for each card in your graveyard."
Override84%
$0.17↑#18411↑0.45↑22.9 years↑
"Counter target spell unless its controller pays
for each artifact you control."
Protect the Negotiators82%
$0.25↑#11807↑0.22↓4.0 years↓
"Counter target spell unless its controller pays
for each creature you control."
Jwari Disruption // Jwari Ruins82%
$0.48↑#2682↑0.265.9 years↓
"Counter target spell unless its controller pays
."