Frightful Delusion 
Instant
$0.08 #26136 0.95 14.9 years
Counter target spell unless its controller pays 
. That player discards a card.
. That player discards a card.Click a line or tag to filter
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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.
Clash of Wills90%
$0.15↑#12548↑0.22↓11.1 years↓
"Counter target spell unless its controller pays 
."
."
Quench90%
$0.20↑#13076↑0.18↓7.6 years↓
"Counter target spell unless its controller pays ."
."
Runeboggle88%
$0.04↓#263620.12↓20.6 years↑
"Counter target spell unless its controller pays ."
."
Mana Tithe86%
$0.78↑#2148↑0.47↓19.6 years↑
"Counter target spell unless its controller pays ."
."
Mindswipe86%
$0.36↑#14660↑0.29↓11.9 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."
It'll Quench Ya!84%
$0.27↑#3783↑0.00↓0.8 years↓
"Counter target spell unless its controller pays ."
."
Soul Read84%
$0.15↑#15849↑0.12↓3.8 years↓
"• Counter target spell unless its controller pays 
."
."
Overrule84%
$0.17↑#210950.50↓20.3 years↑
"Counter target spell unless its controller pays . You gain X life."
. You gain X life."
Offering to Asha84%
$0.09↑#262500.24↓17.3 years↑
"Counter target spell unless its controller pays . You gain 4 life."
. You gain 4 life."
Revolutionary Rebuff84%
$0.11↑#220850.40↓9.9 years↓
"Counter target nonartifact spell unless its controller pays ."
."
Perplex83%
$1.77↑#5172↑1.20↑20.9 years↑
"Counter target spell unless its controller discards their hand."
Force Spike82%
$0.91↑#13278↑0.79↓32.3 years↑
"Counter target spell unless its controller pays ."
."
Deception82%
$2.64↑#295510.15↓27.3 years↑
"Target opponent discards two cards."
Censor81%
$0.21↑#13352↑0.56↓9.4 years↓
"Counter target spell unless its controller pays ."
."
Spell Snip81%
$0.12↑#271240.45↓17.9 years↑
"Counter target spell unless its controller pays ."
."
Spectral Denial81%
$0.35↑#8127↑0.26↓1.4 years↓
"Counter target spell unless its controller pays ."
."
Complicate81%
$0.26↑#13481↑0.33↓23.9 years↑
"Counter target spell unless its controller pays 
."
."
Rethink81%
$0.10↑#230000.38↓26.3 years↑
"Counter target spell unless its controller pays , where X is its mana value."
, where X is its mana value."
Mystical Dispute80%
$0.38↑#11036↑0.24↓6.9 years↓
"Counter target spell unless its controller pays ."
."
Thassa's Intervention80%
$0.41↑#7149↑0.21↓6.6 years↓
"• Counter target spell unless its controller pays twice ."
."