Gainsay 
Instant
$0.05 #24002 0.22 25.6 years
Counter target blue spell.
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Frazzle90%
$0.13↑#29954↓0.11↓20.6 years↓
"Counter target nonblue spell."
Guttural Response88%
$1.39↑#8858↑0.53↑18.3 years↓
"Counter target blue instant spell."
Red Elemental Blast85%
$1.91↑#437↑0.42↑33.1 years↑
"• Counter target blue spell."
Pyroblast85%
$7.96↑#469↑0.38↑31.3 years↑
"• Counter target spell if it's blue."
Cancel85%
$0.06↑#2057↑0.2919.9 years↓
"Counter target spell."
Burnout82%
$1.50↑#12364↑0.60↑30.2 years↑
"Counter target instant spell if it's blue."
Outwit81%
$0.07↑#238690.1814.3 years↓
"Counter target spell that targets a player."
Mystical Dispute80%
$0.38↑#11036↑0.246.9 years↓
"This spell costs 
less to cast if it targets a blue spell."
less to cast if it targets a blue spell."
Contradict78%
$0.06↑#194870.00↓11.4 years↓
"Counter target spell."
Out of Air78%
$0.20↑#13810↑0.53↑2.8 years↓
"Counter target spell."
Ertai's Scorn78%
$0.27↑#9323↑0.174.0 years↓
"Counter target spell."
Last Word77%
$0.65↑#18697↑0.67↑22.6 years↓
"Counter target spell."
Double Negative77%
$0.27↑#209500.09↓17.3 years↓
"Counter up to two target spells."
Familiar's Ruse76%
$0.36↑#6971↑0.12↓18.9 years↓
"Counter target spell."
Frilled Mystic76%
$0.19↑#7189↑0.56↑7.6 years↓
"When this creature enters, you may counter target spell."
Minor Misstep76%
$0.17↑#14720↑1.00↑3.6 years↓
"Counter target spell with mana value 1 or less."
Neutralizing Blast76%
$0.10↑#225340.12↓11.6 years↓
"Counter target multicolored spell."
Thoughtbind76%
$0.05#29397↓0.33↑21.9 years↓
"Counter target spell with mana value 4 or less."
Jace's Defeat75%
$0.07↑#246450.12↓9.1 years↓
"Counter target blue spell. If it was a Jace planeswalker spell, scry 2."
Deprive74%
$0.39↑#9756↑0.1916.4 years↓
"Counter target spell."