Disallow 
Instant
$0.41 #1819 0.45 9.6 years
Counter target spell, activated ability, or triggered ability. (Mana abilities can't be targeted.)
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Voidslime98%
$0.32↓#4511↓0.25↓20.3 years↑
"Counter target spell, activated ability, or triggered ability."
Stifle94%
$9.53↑#4588↓0.77↑23.3 years↑
"Counter target activated or triggered ability."
Bind92%
$5.13↑#15301↓0.00↓25.9 years↑
"Counter target activated ability."
Repudiate // Replicate91%
$0.34↓#9248↓0.507.6 years↓
"Counter target activated or triggered ability."
Squelch89%
$0.26↓#22228↓0.4121.9 years↑
"Counter target activated ability."
Brokers Confluence88%
$1.42↑#10009↓0.55↑4.4 years↓
"• Counter target activated or triggered ability."
Katara's Reversal87%
$1.90↑#11914↓0.00↓0.8 years↓
"Counter up to four target spells and/or abilities."
Tale's End87%
$2.99↑#4793↓0.76↑7.2 years↓
"Counter target activated ability, triggered ability, or legendary spell."
Trickbind86%
$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."
Overcharged Amalgam86%
$0.35↓#4817↓0.22↓4.8 years↓
"When this creature exploits a creature, counter target spell, activated ability, or triggered ability."
Diplomatic Escort84%
$0.14↓#19293↓1.00↑26.9 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%
$0.93↑#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."
Emerald Dragon // Dissonant Wave84%
$0.23↓#9870↓0.00↓4.2 years↓
"Counter target activated or triggered ability from a noncreature source."
Nimble Obstructionist82%
$0.42↑#6212↓0.409.1 years
"When you cycle this card, counter target activated or triggered ability you don't control."
Consign to Memory82%
$3.77↑#7303↓0.26↓2.2 years↓
"Counter target triggered ability or colorless spell."
Rust82%
$0.59↑#27962↓0.06↓32.3 years↑
"Counter target activated ability from an artifact source."
Voidmage Husher81%
$0.24↓#19467↓0.20↓19.9 years↑
"When this creature enters, counter target activated ability."
Azorius Guildmage80%
$0.20↓#14622↓0.4720.3 years↑
"
: Counter target activated ability."
: Counter target activated ability."
Shimmering Glasskite80%
$0.13↓#30656↓0.12↓21.6 years↑
"Whenever this creature becomes the target of a spell or ability for the first time each turn, counter that spell or ability."
Jetting Glasskite80%
$0.10↓#30966↓0.20↓21.6 years↑
"Whenever this creature becomes the target of a spell or ability for the first time each turn, counter that spell or ability."