Undermine 
Instant
$1.76 #6126 0.21 26.0 years
Counter target spell. Its controller loses 3 life.
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Punish Ignorance92%
$0.29↓#24368↓0.33↑18.0 years↓
"Counter target spell. Its controller loses 3 life and you gain 3 life."
Outwit84%
$0.06↓#24186↓0.1814.5 years↓
"Counter target spell that targets a player."
Cancel84%
$0.07↓#2087↑0.31↑20.0 years↓
"Counter target spell."
Countersquall78%
$0.46↓#3538↑0.31↑17.7 years↓
"Counter target noncreature spell. Its controller loses 2 life."
Ionize78%
$0.28↓#7688↓0.32↑8.0 years↓
"Counter target spell. this card deals 2 damage to that spell's controller."
Psychic Barrier77%
$0.22↓#20936↓0.56↑15.4 years↓
"Counter target creature spell. Its controller loses 1 life."
Contradict76%
$0.05↓#19661↓0.1911.6 years↓
"Counter target spell."
Out of Air76%
$0.23↓#14178↓0.182.9 years↓
"Counter target spell."
Ertai's Scorn76%
$0.23↓#9531↓0.32↑4.1 years↓
"Counter target spell."
Frazzle76%
$0.10↓#30324↓0.00↓20.7 years↓
"Counter target nonblue spell."
Vex76%
$0.06↓#24948↓0.1922.7 years↓
"Counter target spell. That spell's controller may draw a card."
Minor Misstep76%
$0.14↓#14966↓0.40↑3.7 years↓
"Counter target spell with mana value 1 or less."
Double Negative75%
$0.24↓#21187↓0.2617.5 years↓
"Counter up to two target spells."
Thoughtbind75%
$0.11↓#29535↓0.1222.1 years↓
"Counter target spell with mana value 4 or less."
Last Word74%
$0.66↓#18710↓0.35↑22.7 years↓
"Counter target spell."
Frilled Mystic74%
$0.22↓#7371↓0.207.7 years↓
"When this creature enters, you may counter target spell."
Voidslime74%
$0.30↓#4603↑0.2820.5 years↓
"Counter target spell, activated ability, or triggered ability."
Mystic Snake74%
$0.62↓#58860.42↑25.4 years
"When this creature enters, counter target spell."
Fall of the Gavel73%
$0.12↓#24932↓0.1214.0 years↓
"Counter target spell. You gain 5 life."
Absorb73%
$0.31↓#3695↑0.32↑26.0 years
"Counter target spell. You gain 3 life."