Undermine 
Instant
$1.59 #6172 0.27 25.9 years
Counter target spell. Its controller loses 3 life.
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Punish Ignorance92%
$0.29↓#24112↓0.16↓17.9 years↓
"Counter target spell. Its controller loses 3 life and you gain 3 life."
Outwit84%
$0.07↓#23869↓0.1814.3 years↓
"Counter target spell that targets a player."
Cancel84%
$0.06↓#2057↑0.2919.9 years↓
"Counter target spell."
Countersquall78%
$0.56↓#3479↑0.2717.6 years↓
"Counter target noncreature spell. Its controller loses 2 life."
Ionize78%
$0.30↓#7534↓0.40↑7.9 years↓
"Counter target spell. this card deals 2 damage to that spell's controller."
Psychic Barrier77%
$0.20↓#20540↓0.52↑15.3 years↓
"Counter target creature spell. Its controller loses 1 life."
Contradict76%
$0.06↓#19487↓0.00↓11.4 years↓
"Counter target spell."
Ertai's Scorn76%
$0.27↓#9323↓0.17↓4.0 years↓
"Counter target spell."
Out of Air76%
$0.20↓#13810↓0.53↑2.8 years↓
"Counter target spell."
Frazzle76%
$0.13↓#29954↓0.11↓20.6 years↓
"Counter target nonblue spell."
Vex76%
$0.06↓#24571↓0.3022.6 years↓
"Counter target spell. That spell's controller may draw a card."
Minor Misstep76%
$0.17↓#14720↓1.00↑3.6 years↓
"Counter target spell with mana value 1 or less."
Double Negative75%
$0.27↓#20950↓0.09↓17.3 years↓
"Counter up to two target spells."
Thoughtbind75%
$0.05↓#29397↓0.3321.9 years↓
"Counter target spell with mana value 4 or less."
Last Word74%
$0.65↓#18697↓0.67↑22.6 years↓
"Counter target spell."
Familiar's Ruse74%
$0.36↓#69710.12↓18.9 years↓
"Counter target spell."
Frilled Mystic74%
$0.19↓#71890.56↑7.6 years↓
"When this creature enters, you may counter target spell."
Voidslime74%
$0.32↓#4511↑0.2520.3 years↓
"Counter target spell, activated ability, or triggered ability."
Mystic Snake74%
$0.62↓#57660.1925.3 years
"When this creature enters, counter target spell."
Fall of the Gavel73%
$0.13↓#24691↓0.2913.9 years↓
"Counter target spell. You gain 5 life."