Gainsay 
Instant
$0.07 #24243 0.07 25.7 years
Counter target blue spell.
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Guttural Response92%
$1.33↑#8885↑0.24↑18.5 years↓
"Counter target blue instant spell."
Red Elemental Blast89%
$2.36↑#450↑0.51↑33.2 years↑
"• Counter target blue spell."
Pyroblast89%
$8.81↑#479↑0.41↑31.4 years↑
"• Counter target spell if it's blue."
Frazzle84%
$0.10↑#30324↓0.0020.7 years↓
"Counter target nonblue spell."
Cancel80%
$0.07#2087↑0.31↑20.0 years↓
"Counter target spell."
Jace's Defeat78%
$0.10↑#237050.059.3 years↓
"Counter target blue spell. If it was a Jace planeswalker spell, scry 2."
Burnout78%
$1.61↑#12476↑0.0030.4 years↑
"Counter target instant spell if it's blue."
Precise Redaction78%
$0.14↑#262260.140.0 years↓
"Counter target white or black spell."
Outwit76%
$0.06↓#241860.18↑14.5 years↓
"Counter target spell that targets a player."
Autumn's Veil76%
$0.60↑#3162↑0.40↑16.3 years↓
"Spells you control can't be countered by blue or black spells this turn, and creatures you control can't be the targets of blue or black spells this turn."
Out of Air74%
$0.23↑#14178↑0.18↑2.9 years↓
"Counter target spell."
Ertai's Scorn74%
$0.23↑#9531↑0.32↑4.1 years↓
"Counter target spell."
Contradict74%
$0.05↓#196610.19↑11.6 years↓
"Counter target spell."
Rending Volley74%
$0.21↑#13790↑0.1311.6 years↓
"This spell can't be countered."
Mystical Dispute74%
$0.37↑#10856↑0.007.0 years↓
"This spell costs 
less to cast if it targets a blue spell."
less to cast if it targets a blue spell."
Flashfreeze74%
$0.07#203870.0620.2 years↓
"Counter target red or green spell."
Circle of Protection: Blue74%
$0.09↑#220470.27↑33.2 years↑
": The next time a blue source of your choice would deal damage to you this turn, prevent that damage."
: The next time a blue source of your choice would deal damage to you this turn, prevent that damage."
Last Word74%
$0.66↑#18710↑0.35↑22.7 years↓
"Counter target spell."
Sphere of Reason74%
$0.24↑#30158↓0.1625.1 years
"If a blue source would deal damage to you, prevent 2 of that damage."
Fry73%
$0.17↑#232490.137.3 years↓
"This spell can't be countered."