Rust 
Instant
$0.54 #28266 0.06 32.4 years
Counter target activated ability from an artifact source. (Mana abilities can't be targeted.)
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Interdict89%
$0.35↓#227510.29↑29.0 years↓
"Counter target activated ability from an artifact, creature, enchantment, or land. That permanent's activated abilities can't be activated this turn."
Brown Ouphe86%
$0.16↓#251630.25↑31.4 years↓
"
, 
: Counter target activated ability from an artifact source."
, : Counter target activated ability from an artifact source."
Stifle86%
$10.19↑#4593↑0.71↑23.4 years↓
"Counter target activated or triggered ability."
Bind84%
$5.48↑#15456↑0.58↑26.0 years↓
"Counter target activated ability."
Disallow82%
$0.37↓#1829↑0.44↑9.7 years↓
"Counter target spell, activated ability, or triggered ability."
Squelch80%
$0.27↓#22525↑0.38↑22.1 years↓
"Counter target activated ability."
Repudiate // Replicate80%
$0.31↓#9490↑0.127.7 years↓
"Counter target activated or triggered ability."
Ayesha Tanaka80%
$0.33↓#261260.35↑32.4 years
": Counter target activated ability from an artifact source unless that ability's controller pays 
."
: Counter target activated ability from an artifact source unless that ability's controller pays ."
Ouphe Vandals78%
$0.22↓#291140.24↑22.4 years↓
", Sacrifice this creature: Counter target activated ability from an artifact source and destroy that artifact if it's on the battlefield."
, Sacrifice this creature: Counter target activated ability from an artifact source and destroy that artifact if it's on the battlefield."
Artifact Blast77%
$2.27↑#18182↑0.59↑32.6 years
"Counter target artifact spell."
Voidslime77%
$0.30↓#4603↑0.28↑20.5 years↓
"Counter target spell, activated ability, or triggered ability."
Spell Blast76%
$0.04↓#20113↑0.28↑33.2 years
"Counter target spell with mana value X."
Trickbind74%
$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."
Intervene74%
$0.31↓#16034↑0.0027.7 years↓
"Counter target spell that targets a creature."
Green Slime74%
$1.66↑#5603↑0.064.4 years↓
"When this creature enters, counter target activated or triggered ability from an artifact or enchantment source. If a permanent's ability is countered this way, destroy that permanent."
Emerald Dragon // Dissonant Wave73%
$0.22↓#10160↑0.074.4 years↓
"Counter target activated or triggered ability from a noncreature source."
Dismiss73%
$0.14↓#11834↑0.31↑29.0 years↓
"Counter target spell."
Brokers Confluence72%
$1.40↑#10269↑0.144.5 years↓
"• Counter target activated or triggered ability."
Annul72%
$0.19↓#4556↑0.35↑28.0 years↓
"Counter target artifact or enchantment spell."
Counterspell72%
$2.11↑#16↑0.96↑33.2 years
"Counter target spell."