Nix 
Instant
$0.97 #25501 0.24 19.3 years
Counter target spell if no mana was spent to cast it.
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Unravel88%
$0.18↓#14001↑0.11↓1.1 years↓
"Counter target spell. If the amount of mana spent to cast that spell was less than its mana value, you draw a card."
Cancel80%
$0.06↓#2057↑0.2919.9 years
"Counter target spell."
Vexing Bauble78%
$2.17↑#1304↑0.51↑2.2 years↓
"Whenever a player casts a spell, if no mana was spent to cast it, counter that spell."
Outwit76%
$0.07↓#238690.1814.3 years↓
"Counter target spell that targets a player."
Minor Misstep76%
$0.17↓#14720↑1.00↑3.6 years↓
"Counter target spell with mana value 1 or less."
Thoughtbind76%
$0.05↓#293970.3321.9 years↑
"Counter target spell with mana value 4 or less."
Void Mirror76%
$0.37↓#15611↑1.00↑5.3 years↓
"Whenever a player casts a spell, if no colored mana was spent to cast it, counter that spell."
Frazzle74%
$0.13↓#299540.11↓20.6 years↑
"Counter target nonblue spell."
Out of Air74%
$0.20↓#13810↑0.53↑2.8 years↓
"Counter target spell."
Contradict74%
$0.06↓#19487↑0.00↓11.4 years↓
"Counter target spell."
Ertai's Scorn74%
$0.27↓#9323↑0.174.0 years↓
"Counter target spell."
Last Word73%
$0.65↓#18697↑0.67↑22.6 years↑
"Counter target spell."
Boromir, Warden of the Tower73%
$6.61↑#851↑0.60↑3.2 years↓
"Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell."
Lavinia, Azorius Renegade72%
$0.18↓#3183↑0.91↑7.6 years↓
"Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell."
Familiar's Ruse72%
$0.36↓#6971↑0.12↓18.9 years
"Counter target spell."
Double Negative72%
$0.27↓#209500.09↓17.3 years↓
"Counter up to two target spells."
Spell Snare72%
$0.42↓#8442↑0.39↑20.3 years
"Counter target spell with mana value 2."
Deprive71%
$0.39↓#9756↑0.1916.4 years↓
"Counter target spell."
Frilled Mystic71%
$0.19↓#7189↑0.56↑7.6 years↓
"When this creature enters, you may counter target spell."
Second Guess70%
$0.08↓#260880.2414.3 years↓
"Counter target spell that's the second spell cast this turn."