Clash of Wills 
Instant
$0.15 #12548 0.22 11.1 years
Counter target spell unless its controller pays .
.Click a line or tag to filter
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.
Quench100%
$0.20↑#130760.187.6 years↓
"Counter target spell unless its controller pays 
."
."
Runeboggle97%
$0.04↓#26362↓0.12↓20.6 years↑
"Counter target spell unless its controller pays 
."
."
Mana Tithe96%
$0.78↑#2148↑0.47↑19.6 years↑
"Counter target spell unless its controller pays ."
."
It'll Quench Ya!96%
$0.27↑#3783↑0.00↓0.8 years↓
"Counter target spell unless its controller pays ."
."
Soul Read94%
$0.15#15849↓0.12↓3.8 years↓
"• Counter target spell unless its controller pays 
."
."
Mindswipe94%
$0.36↑#146600.2911.9 years
"Counter target spell unless its controller pays . this card deals X damage to that spell's controller."
. this card deals X damage to that spell's controller."
Force Spike94%
$0.91↑#132780.79↑32.3 years↑
"Counter target spell unless its controller pays ."
."
Overrule94%
$0.17↑#21095↓0.50↑20.3 years↑
"Counter target spell unless its controller pays . You gain X life."
. You gain X life."
Offering to Asha94%
$0.09↓#26250↓0.2417.3 years↑
"Counter target spell unless its controller pays . You gain 4 life."
. You gain 4 life."
Revolutionary Rebuff94%
$0.11↓#22085↓0.40↑9.9 years↓
"Counter target nonartifact spell unless its controller pays ."
."
Spectral Denial93%
$0.35↑#8127↑0.261.4 years↓
"Counter target spell unless its controller pays ."
."
Mystical Dispute93%
$0.38↑#110360.246.9 years↓
"Counter target spell unless its controller pays 
."
."
Complicate93%
$0.26↑#134810.33↑23.9 years↑
"Counter target spell unless its controller pays ."
."
Rethink92%
$0.10↓#23000↓0.38↑26.3 years↑
"Counter target spell unless its controller pays , where X is its mana value."
, where X is its mana value."
Censor92%
$0.21↑#133520.56↑9.4 years↓
"Counter target spell unless its controller pays ."
."
Spell Snip92%
$0.12↓#27124↓0.45↑17.9 years↑
"Counter target spell unless its controller pays ."
."
Supreme Will92%
$0.14↓#8791↑0.309.1 years↓
"• Counter target spell unless its controller pays ."
."
Quandrix Charm92%
$0.17↑#7995↑0.00↓0.4 years↓
"• Counter target spell unless its controller pays ."
."
Thassa's Intervention92%
$0.41↑#7149↑0.216.6 years↓
"• Counter target spell unless its controller pays twice ."
."
Confounding Riddle92%
$0.28↑#7634↑0.12↓2.8 years↓
"• Counter target spell unless its controller pays ."
."