Guttural Response 
Instant
$1.39 #8858 0.53 18.3 years
Counter target blue instant spell.
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Burnout96%
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"Counter target instant spell if it's blue."
Dispel90%
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"Counter target instant spell."
Gainsay88%
$0.05↓#24002↓0.22↓25.6 years↑
"Counter target blue spell."
Flash Counter82%
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"Counter target instant spell."
Red Elemental Blast80%
$1.91↑#437↑0.42↓33.1 years↑
"• Counter target blue spell."
Pyroblast80%
$7.96↑#469↑0.38↓31.3 years↑
"• Counter target spell if it's blue."
Bant Charm77%
$0.28↓#4974↑0.39↓17.9 years
"• Counter target instant spell."
Frazzle72%
$0.13↓#29954↓0.11↓20.6 years↑
"Counter target nonblue spell."
Muddle the Mixture72%
$1.84↑#694↑0.4420.9 years↑
"Counter target instant or sorcery spell."
Psychic Rebuttal72%
$0.20↓#20057↓0.19↓11.1 years↓
"Counter target instant or sorcery spell that targets you."
Avoid Fate72%
$10.59↑#83330.5932.3 years↑
"Counter target instant or Aura spell that targets a permanent you control."
Miscast72%
$1.20↓#2696↑0.31↓6.2 years↓
"Counter target instant or sorcery spell unless its controller pays 
."
."
Obscura Charm70%
$0.22↓#85400.29↓4.4 years↓
"• Counter target instant or sorcery spell."