Stifle 
Instant
$9.53 #4588 0.77 23.3 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%
$0.32↓#45110.25↓20.3 years↓
"Counter target spell, activated ability, or triggered ability."
Trickbind89%
$9.21↓#6494↓0.14↓19.9 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%
$2.99↓#47930.767.2 years↓
"Counter target activated ability, triggered ability, or legendary spell."
Emerald Dragon // Dissonant Wave87%
$0.23↓#9870↓0.00↓4.2 years↓
"Counter target activated or triggered ability from a noncreature source."
Nimble Obstructionist87%
$0.42↓#6212↓0.40↓9.1 years↓
"When you cycle this card, counter target activated or triggered ability you don't control."
Azorius Guildmage86%
$0.20↓#14622↓0.47↓20.3 years↓
"
: Counter target activated ability."
: Counter target activated ability."
Rust86%
$0.59↓#27962↓0.06↓32.3 years↑
"Counter target activated ability from an artifact source."
Voidmage Husher84%
$0.24↓#19467↓0.20↓19.9 years↓
"When this creature enters, counter target activated ability."
Sublime Epiphany82%
$0.21↓#1708↑0.32↓6.2 years↓
"• Counter target activated or triggered ability."
Katara's Reversal82%
$1.90↓#11914↓0.00↓0.8 years↓
"Counter up to four target spells and/or abilities."
Defabricate82%
$0.17↓#6408↓0.31↓3.8 years↓
"• Counter target activated or triggered ability."
Louisoix's Sacrifice82%
$0.34↓#6183↓0.29↓1.2 years↓
"Counter target activated ability, triggered ability, or noncreature spell."
Rimewind Cryomancer81%
$0.32↓#16866↓0.43↓20.1 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%
$0.93↓#9611↓0.20↓3.9 years↓
"Counter target spell, activated ability, or triggered ability. Its controller loses life equal to the number of creatures you control."
Consign to Memory80%
$3.77↓#7303↓0.26↓2.2 years↓
"Counter target triggered ability or colorless spell."