Louisoix's Sacrifice 
Instant
$0.34 #6003 0.53 1.4 years
As an additional cost to cast this spell, sacrifice a legendary creature or pay 
.
.Counter target activated ability, triggered ability, or noncreature spell.
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Bayou Groff85%
$0.13↓#19968↓0.21↓5.5 years↑
"As an additional cost to cast this spell, sacrifice a creature or pay 
."
."
Morkrut Behemoth84%
$0.07↓#21103↓0.31↓5.1 years↑
"As an additional cost to cast this spell, sacrifice a creature or pay 
."
."
Lash of the Balrog83%
$0.16↓#7369↓0.23↓3.3 years↑
"As an additional cost to cast this spell, sacrifice a creature or pay 
."
."
Spark Harvest82%
$0.15↓#11825↓0.06↓7.5 years↑
"As an additional cost to cast this spell, sacrifice a creature or pay ."
."
Stifle81%
$10.19↑#4593↑0.71↑23.4 years↑
"Counter target activated or triggered ability."
Eaten Alive80%
$0.11↓#3135↑0.11↓5.1 years↑
"As an additional cost to cast this spell, sacrifice a creature or pay ."
."
Negate80%
$0.16↓#57↑0.42↓18.7 years↑
"Counter target noncreature spell."
Disallow79%
$0.37↑#1829↑0.449.7 years↑
"Counter target spell, activated ability, or triggered ability."
Emerald Dragon // Dissonant Wave78%
$0.22↓#10160↓0.07↓4.4 years↑
"Counter target activated or triggered ability from a noncreature source."
Bind77%
$5.48↑#15456↓0.5826.0 years↑
"Counter target activated ability."
Repudiate // Replicate76%
$0.31↓#9490↓0.12↓7.7 years↑
"Counter target activated or triggered ability."
Scatter Arc76%
$0.18↓#21814↓0.18↓13.7 years↑
"Counter target noncreature spell."
Voidslime76%
$0.30↓#4603↑0.28↓20.5 years↑
"Counter target spell, activated ability, or triggered ability."
Dovin's Veto76%
$2.29↑#228↑0.72↑7.5 years↑
"Counter target noncreature spell."
Stir Up Trouble75%
$0.16↓#15616↓0.15↓0.2 years↓
"As an additional cost to cast this spell, sacrifice an artifact or creature or pay ."
."
Deadly Precision74%
$0.17↓#10890↓0.18↓0.9 years
"As an additional cost to cast this spell, pay or sacrifice an artifact or creature."
or sacrifice an artifact or creature."
Ultimate Nullification74%
$0.22↓#21715↓0.69↑0.3 years↓
"As an additional cost to cast this spell, sacrifice a legendary creature."
Squelch74%
$0.27↓#22525↓0.38↓22.1 years↑
"Counter target activated ability."
Betrayer's Bargain74%
$0.15↓#18073↓0.27↓2.1 years
"As an additional cost to cast this spell, sacrifice a creature or enchantment or pay ."
."
Annihilating Glare73%
$0.30↓#7821↓0.15↓3.7 years↑
"As an additional cost to cast this spell, pay or sacrifice an artifact or creature."
or sacrifice an artifact or creature."