Nix 
Instant
$0.98 #25782 0.06 19.5 years
Counter target spell if no mana was spent to cast it.
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Unravel88%
$0.15↓#13832↑0.121.2 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%
$0.07↓#2087↑0.31↑20.0 years
"Counter target spell."
Vexing Bauble78%
$2.98↑#1297↑0.80↑2.3 years↓
"Whenever a player casts a spell, if no mana was spent to cast it, counter that spell."
Outwit76%
$0.06↓#241860.18↑14.5 years↓
"Counter target spell that targets a player."
Minor Misstep76%
$0.14↓#14966↑0.40↑3.7 years↓
"Counter target spell with mana value 1 or less."
Thoughtbind76%
$0.11↓#295350.1222.1 years↑
"Counter target spell with mana value 4 or less."
Void Mirror76%
$0.39↓#15623↑0.89↑5.5 years↓
"Whenever a player casts a spell, if no colored mana was spent to cast it, counter that spell."
Frazzle74%
$0.10↓#303240.0020.7 years↑
"Counter target nonblue spell."
Contradict74%
$0.05↓#19661↑0.19↑11.6 years↓
"Counter target spell."
Ertai's Scorn74%
$0.23↓#9531↑0.32↑4.1 years↓
"Counter target spell."
Out of Air74%
$0.23↓#14178↑0.18↑2.9 years↓
"Counter target spell."
Last Word73%
$0.66↓#18710↑0.35↑22.7 years↑
"Counter target spell."
Boromir, Warden of the Tower73%
$4.45↑#874↑0.64↑3.3 years↓
"Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell."
Lavinia, Azorius Renegade72%
$0.27↓#3214↑1.10↑7.7 years↓
"Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell."
Double Negative72%
$0.24↓#211870.26↑17.5 years↓
"Counter up to two target spells."
Spell Snare72%
$0.36↓#8395↑0.35↑20.5 years
"Counter target spell with mana value 2."
Frilled Mystic71%
$0.22↓#7371↑0.20↑7.7 years↓
"When this creature enters, you may counter target spell."
Familiar's Ruse70%
$0.33↓#7119↑0.53↑19.0 years
"Counter target spell."
Second Guess70%
$0.10↓#263230.33↑14.5 years↓
"Counter target spell that's the second spell cast this turn."
Deprive70%
$0.48↓#9909↑0.37↑16.5 years↓
"Counter target spell."