Flare of Denial 
Instant
$3.26 #1451 1.09 2.3 years
You may sacrifice a nontoken blue creature rather than pay this spell's mana cost.
Counter target spell.
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Foil90%
$1.67↓#4262↓0.90↓26.4 years↑
"Counter target spell."
Thwart88%
$0.73↓#15515↓0.33↓27.0 years↑
"Counter target spell."
Pact of Negation83%
$15.96↑#372↑1.48↑19.5 years↑
"Counter target spell."
Delraich82%
$1.20↓#27815↓0.11↓27.0 years↑
"You may sacrifice three black creatures rather than pay this spell's mana cost."
Disrupting Shoal80%
$16.05↑#9387↓0.31↓21.7 years↑
"You may exile a blue card with mana value X from your hand rather than pay this spell's mana cost."
+1 more matching line
Flare of Malice78%
$3.16↓#13040.66↓2.3 years
"You may sacrifice a nontoken black creature rather than pay this spell's mana cost."
Flare of Duplication78%
$2.41↓#1141↑0.47↓2.3 years
"You may sacrifice a nontoken red creature rather than pay this spell's mana cost."
Mental Misstep78%
$5.95↑#474↑0.91↓15.4 years↑
"Counter target spell with mana value 1."
Flare of Cultivation78%
$0.71↓#2214↓0.29↓2.3 years
"You may sacrifice a nontoken green creature rather than pay this spell's mana cost."
Ice Out78%
$0.24↓#8004↓0.25↓3.1 years
"Counter target spell."
Not of This World78%
$5.90↑#2376↓0.47↓16.5 years↑
"Counter target spell or ability that targets a permanent you control."
Demon of Death's Gate76%
$2.90↓#13727↓0.22↓16.3 years↑
"You may pay 6 life and sacrifice three black creatures rather than pay this spell's mana cost."
Daze75%
$0.87↓#2995↓0.59↓26.7 years↑
"Counter target spell unless its controller pays ."
."
Flare of Fortitude74%
$5.15↑#736↑0.71↓2.3 years
"You may sacrifice a nontoken white creature rather than pay this spell's mana cost."
Cancel74%
$0.07↓#2087↓0.31↓20.0 years↑
"Counter target spell."
Mind Swords74%
$0.17↓#24542↓0.65↓26.7 years↑
"If you control a Swamp, you may sacrifice a creature rather than pay this spell's mana cost."
Force of Will74%
$55.32↑#204↑2.15↑30.4 years↑
"You may pay 1 life and exile a blue card from your hand rather than pay this spell's mana cost."
+1 more matching line
Saw It Coming74%
$0.36↓#3132↓0.30↓5.7 years↑
"Counter target spell."
Thunderclap73%
$0.18↓#15938↓0.00↓27.0 years↑
"You may sacrifice a Mountain rather than pay this spell's mana cost."
Admiral's Order73%
$0.30↓#11505↓0.31↓8.8 years↑
"Counter target spell."