Stifle 
Instant
$10.19 #4593 0.71 23.4 years
Counter target activated or triggered ability. (Mana abilities can't be targeted.)
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Repudiate // Replicate96%
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"Counter target activated or triggered ability."
Bind96%
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"Counter target activated ability."
Disallow94%
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"Counter target spell, activated ability, or triggered ability."
Squelch93%
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"Counter target activated ability."
Brokers Confluence92%
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"• Counter target activated or triggered ability."
Voidslime92%
$0.30↓#46030.28↓20.5 years↓
"Counter target spell, activated ability, or triggered ability."
Trickbind89%
$10.50↑#6550↓0.6420.0 years↓
"Counter target activated or triggered ability. If a permanent's ability is countered this way, activated abilities of that permanent can't be activated this turn."
Tale's End88%
$3.16↓#48580.787.3 years↓
"Counter target activated ability, triggered ability, or legendary spell."
Emerald Dragon // Dissonant Wave87%
$0.22↓#10160↓0.07↓4.4 years↓
"Counter target activated or triggered ability from a noncreature source."
Nimble Obstructionist87%
$0.37↓#6386↓0.19↓9.3 years↓
"When you cycle this card, counter target activated or triggered ability you don't control."
Azorius Guildmage86%
$0.21↓#14864↓0.06↓20.5 years↓
"
: Counter target activated ability."
: Counter target activated ability."
Rust86%
$0.54↓#28266↓0.06↓32.4 years↑
"Counter target activated ability from an artifact source."
Voidmage Husher84%
$0.27↓#19845↓0.6120.0 years↓
"When this creature enters, counter target activated ability."
Sublime Epiphany82%
$0.26↓#1687↑0.38↓6.3 years↓
"• Counter target activated or triggered ability."
Katara's Reversal82%
$1.83↓#11707↓0.630.9 years↓
"Counter up to four target spells and/or abilities."
Defabricate82%
$0.22↓#6538↓0.41↓3.9 years↓
"• Counter target activated or triggered ability."
Louisoix's Sacrifice81%
$0.34↓#6003↓0.53↓1.4 years↓
"Counter target activated ability, triggered ability, or noncreature spell."
Rimewind Cryomancer81%
$0.33↓#17153↓0.33↓20.2 years↓
"
, 
: Counter target activated ability. Activate only if you control four or more snow permanents."
, : Counter target activated ability. Activate only if you control four or more snow permanents."
Deny the Witch81%
$0.95↓#9863↓0.47↓4.0 years↓
"Counter target spell, activated ability, or triggered ability. Its controller loses life equal to the number of creatures you control."
Brown Ouphe80%
$0.16↓#25163↓0.25↓31.4 years↑
"
, : Counter target activated ability from an artifact source."
, : Counter target activated ability from an artifact source."