Clash of Wills 

Instant
$0.20 #12412 0.29 11.3 years
Counter target spell unless its controller pays
.
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Cards similar to Clash of Wills 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.
Mindswipe94%
$0.33↑#14900↓0.13↓12.1 years
"Counter target spell unless its controller pays
. this card deals X damage to that spell's controller."
Overrule94%
$0.15↓#21300↓0.10↓20.5 years↑
"Counter target spell unless its controller pays
. You gain X life."
Offering to Asha94%
$0.07↓#26456↓0.00↓17.5 years↑
"Counter target spell unless its controller pays
. You gain 4 life."
Revolutionary Rebuff94%
$0.11↓#22359↓0.1910.1 years↓
"Counter target nonartifact spell unless its controller pays
."
Rethink92%
$0.13↓#23354↓0.43↑26.4 years↑
"Counter target spell unless its controller pays
, where X is its mana value."
Thassa's Intervention92%
$0.35↑#7202↑0.11↓6.7 years↓
"• Counter target spell unless its controller pays twice
."
Confounding Riddle92%
$0.30↑#7676↑0.06↓2.9 years↓
"• Counter target spell unless its controller pays
."