Flare of Denial 
Instant
$3.54 #1426 1.01 2.2 years
You may sacrifice a nontoken blue creature rather than pay this spell's mana cost.
Counter target spell.
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Foil88%
$1.67↓#4267↓0.86↓26.3 years↑
"Counter target spell."
Thwart88%
$0.80↓#15428↓0.50↓26.9 years↑
"Counter target spell."
Pact of Negation84%
$17.65↑#364↑1.46↑19.3 years↑
"Counter target spell."
Delraich82%
$1.11↓#27416↓0.00↓26.9 years↑
"You may sacrifice three black creatures rather than pay this spell's mana cost."
Disrupting Shoal80%
$15.34↑#9978↓0.57↓21.6 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
Mental Misstep78%
$5.90↑#462↑0.79↓15.3 years↑
"Counter target spell with mana value 1."
Ice Out78%
$0.26↓#7797↓0.35↓3.0 years
"Counter target spell."
Not of This World78%
$5.78↑#2467↓0.50↓16.4 years↑
"Counter target spell or ability that targets a permanent you control."
Flare of Duplication78%
$1.93↓#1126↑0.57↓2.2 years
"You may sacrifice a nontoken red creature rather than pay this spell's mana cost."
Flare of Cultivation76%
$0.60↓#2166↓0.19↓2.2 years
"You may sacrifice a nontoken green creature rather than pay this spell's mana cost."
Demon of Death's Gate76%
$2.39↓#13593↓0.14↓16.1 years↑
"You may pay 6 life and sacrifice three black creatures rather than pay this spell's mana cost."
Cancel74%
$0.06↓#2057↓0.29↓19.9 years↑
"Counter target spell."
Morkrut Behemoth74%
$0.06↓#20823↓0.36↓4.9 years↑
"As an additional cost to cast this spell, sacrifice a creature or pay 
."
."
Daze74%
$1.11↓#3055↓0.51↓26.6 years↑
"Counter target spell unless its controller pays ."
."
Flare of Fortitude74%
$4.34↑#739↑0.71↓2.2 years
"You may sacrifice a nontoken white creature rather than pay this spell's mana cost."
Ertai's Scorn74%
$0.27↓#9323↓0.17↓4.0 years↑
"Counter target spell."
Flare of Malice73%
$2.05↓#12860.62↓2.2 years
"You may sacrifice a nontoken black creature rather than pay this spell's mana cost."
Bayou Groff73%
$0.15↓#19673↓0.00↓5.4 years↑
"As an additional cost to cast this spell, sacrifice a creature or pay 
."
."
Force of Will72%
$58.18↑#192↑2.01↑30.2 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
Out of Bounds72%
$0.22↓#18301↓0.44↓8.2 years↑
"Counter target spell."