Voidslime 
Instant
$0.32 #4511 0.25 20.3 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%
$0.41↑#1819↑0.45↑9.6 years↓
"Counter target spell, activated ability, or triggered ability."
Stifle92%
$9.53↑#45880.77↑23.3 years↑
"Counter target activated or triggered ability."
Repudiate // Replicate89%
$0.34↑#9248↓0.50↑7.6 years↓
"Counter target activated or triggered ability."
Bind89%
$5.13↑#15301↓0.00↓25.9 years↑
"Counter target activated ability."
Squelch86%
$0.26↓#22228↓0.41↑21.9 years↑
"Counter target activated ability."
Brokers Confluence83%
$1.42↑#10009↓0.55↑4.4 years↓
"• Counter target activated or triggered ability."
Tale's End82%
$2.99↑#47930.76↑7.2 years↓
"Counter target activated ability, triggered ability, or legendary spell."
Katara's Reversal82%
$1.90↑#11914↓0.00↓0.8 years↓
"Counter up to four target spells and/or abilities."
Deny the Witch82%
$0.93↑#9611↓0.203.9 years↓
"Counter target spell, activated ability, or triggered ability. Its controller loses life equal to the number of creatures you control."
Trickbind81%
$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 Amalgam81%
$0.35↑#48170.224.8 years↓
"When this creature exploits a creature, counter target spell, activated ability, or triggered ability."
Emerald Dragon // Dissonant Wave80%
$0.23↓#9870↓0.00↓4.2 years↓
"Counter target activated or triggered ability from a noncreature source."
Diplomatic Escort80%
$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."
Consign to Memory78%
$3.77↑#7303↓0.262.2 years↓
"Counter target triggered ability or colorless spell."
Nimble Obstructionist78%
$0.42↑#6212↓0.40↑9.1 years↓
"When you cycle this card, counter target activated or triggered ability you don't control."
Voidmage Husher77%
$0.24↓#19467↓0.2019.9 years
"When this creature enters, counter target activated ability."
Rust77%
$0.59↑#27962↓0.06↓32.3 years↑
"Counter target activated ability from an artifact source."
Shimmering Glasskite76%
$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 Glasskite76%
$0.10↓#30966↓0.2021.6 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%
$0.20↓#14622↓0.47↑20.3 years
"
: Counter target activated ability."
: Counter target activated ability."