Disallow 
Instant
$0.37 #1829 0.44 9.7 years
Counter target spell, activated ability, or triggered ability. (Mana abilities can't be targeted.)
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Voidslime98%
$0.30↓#4603↓0.28↓20.5 years↑
"Counter target spell, activated ability, or triggered ability."
Stifle94%
$10.19↑#4593↓0.71↑23.4 years↑
"Counter target activated or triggered ability."
Bind92%
$5.48↑#15456↓0.58↑26.0 years↑
"Counter target activated ability."
Repudiate // Replicate91%
$0.31↓#9490↓0.12↓7.7 years↓
"Counter target activated or triggered ability."
Squelch89%
$0.27↓#22525↓0.3822.1 years↑
"Counter target activated ability."
Brokers Confluence88%
$1.40↑#10269↓0.14↓4.5 years↓
"• Counter target activated or triggered ability."
Katara's Reversal87%
$1.83↑#11707↓0.63↑0.9 years↓
"Counter up to four target spells and/or abilities."
Tale's End87%
$3.16↑#4858↓0.78↑7.3 years↓
"Counter target activated ability, triggered ability, or legendary spell."
Trickbind86%
$10.50↑#6550↓0.64↑20.0 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."
Overcharged Amalgam86%
$0.38↑#4938↓0.474.9 years↓
"When this creature exploits a creature, counter target spell, activated ability, or triggered ability."
Diplomatic Escort84%
$0.12↓#19409↓0.4227.0 years↑
", 
, Discard a card: Counter target spell or ability that targets a creature."
, , Discard a card: Counter target spell or ability that targets a creature."
Deny the Witch84%
$0.95↑#9863↓0.474.0 years↓
"Counter target spell, activated ability, or triggered ability. Its controller loses life equal to the number of creatures you control."
Emerald Dragon // Dissonant Wave84%
$0.22↓#10160↓0.07↓4.4 years↓
"Counter target activated or triggered ability from a noncreature source."
Nimble Obstructionist82%
$0.37#6386↓0.19↓9.3 years
"When you cycle this card, counter target activated or triggered ability you don't control."
Rust82%
$0.54↑#28266↓0.06↓32.4 years↑
"Counter target activated ability from an artifact source."
Consign to Memory81%
$3.88↑#7257↓0.382.3 years↓
"Counter target triggered ability or colorless spell."
Voidmage Husher81%
$0.27↓#19845↓0.61↑20.0 years↑
"When this creature enters, counter target activated ability."
Azorius Guildmage80%
$0.21↓#14864↓0.06↓20.5 years↑
"
: Counter target activated ability."
: Counter target activated ability."
Jetting Glasskite80%
$0.05↓#31218↓0.19↓21.7 years↑
"Whenever this creature becomes the target of a spell or ability for the first time each turn, counter that spell or ability."
Shimmering Glasskite80%
$0.13↓#30917↓0.06↓21.7 years↑
"Whenever this creature becomes the target of a spell or ability for the first time each turn, counter that spell or ability."