Rune Snag 

Instant
$0.07 #28802 0.24 20.2 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%
$0.04↓#18808↑0.2911.7 years↓
"Counter target spell unless its controller pays
for each card in your graveyard."
Countervailing Winds88%
$0.23↑#9184↑0.50↑9.3 years↓
"Counter target spell unless its controller pays
for each card in your graveyard."
Evasive Action87%
$0.26↑#18189↑0.44↑25.4 years↑
"Counter target spell unless its controller pays
for each basic land type among lands you control."
Flip the Switch86%
$0.22↑#13031↑0.335.1 years↓
"Counter target spell unless its controller pays
. Create a 2/2 black Zombie creature token with decayed."
Oppressive Will85%
$0.18↑#243980.43↑21.4 years↑
"Counter target spell unless its controller pays
for each card in your hand."
Circular Logic84%
$0.28↑#7648↑0.57↑24.7 years↑
"Counter target spell unless its controller pays
for each card in your graveyard."
Override82%
$0.17↑#18551↑0.41↑23.0 years↑
"Counter target spell unless its controller pays
for each artifact you control."
Protect the Negotiators82%
$0.27↑#12123↑0.294.1 years↓
"Counter target spell unless its controller pays
for each creature you control."
Jwari Disruption // Jwari Ruins82%
$0.38↑#2670↑0.236.1 years↓
"Counter target spell unless its controller pays
."