Voidslime 
Instant
$0.30 #4603 0.28 20.5 years
Counter target spell, activated ability, or triggered ability. (Mana abilities can't be targeted.)
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Cards similar to Voidslime expected a card that isn't here?
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Disallow98%
$0.37↑#1829↑0.44↑9.7 years↓
"Counter target spell, activated ability, or triggered ability."
Stifle92%
$10.19↑#45930.71↑23.4 years↑
"Counter target activated or triggered ability."
Repudiate // Replicate89%
$0.31↑#9490↓0.12↓7.7 years↓
"Counter target activated or triggered ability."
Bind89%
$5.48↑#15456↓0.58↑26.0 years↑
"Counter target activated ability."
Squelch86%
$0.27↓#22525↓0.3822.1 years↑
"Counter target activated ability."
Brokers Confluence83%
$1.40↑#10269↓0.14↓4.5 years↓
"• Counter target activated or triggered ability."
Katara's Reversal82%
$1.83↑#11707↓0.63↑0.9 years↓
"Counter up to four target spells and/or abilities."
Tale's End82%
$3.16↑#48580.78↑7.3 years↓
"Counter target activated ability, triggered ability, or legendary spell."
Deny the Witch82%
$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."
Trickbind82%
$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 Amalgam81%
$0.38↑#49380.47↑4.9 years↓
"When this creature exploits a creature, counter target spell, activated ability, or triggered ability."
Emerald Dragon // Dissonant Wave80%
$0.22↓#10160↓0.07↓4.4 years↓
"Counter target activated or triggered ability from a noncreature source."
Diplomatic Escort80%
$0.12↓#19409↓0.42↑27.0 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."
Nimble Obstructionist78%
$0.37↑#6386↓0.199.3 years↓
"When you cycle this card, counter target activated or triggered ability you don't control."
Consign to Memory78%
$3.88↑#7257↓0.382.3 years↓
"Counter target triggered ability or colorless spell."
Voidmage Husher78%
$0.27↓#19845↓0.61↑20.0 years
"When this creature enters, counter target activated ability."
Rust77%
$0.54↑#28266↓0.06↓32.4 years↑
"Counter target activated ability from an artifact source."
Jetting Glasskite76%
$0.05↓#31218↓0.1921.7 years↑
"Whenever this creature becomes the target of a spell or ability for the first time each turn, counter that spell or ability."
Shimmering Glasskite76%
$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."
Azorius Guildmage76%
$0.21↓#14864↓0.06↓20.5 years
"
: Counter target activated ability."
: Counter target activated ability."