Spell Rupture 

Instant
$0.14 #11486 0.11 13.6 years
Counter target spell unless its controller pays
, where X is the greatest power among creatures you control.
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Repulsive Mutation94%
$0.64↑#2788↑0.32↑2.6 years↓
"Put X +1/+1 counters on target creature you control. Then counter up to one target spell unless its controller pays mana equal to the greatest power among creatures you control."
Overrule86%
$0.17↑#21095↓0.50↑20.3 years↑
"Counter target spell unless its controller pays
. You gain X life."
Mindswipe86%
$0.36↑#14660↓0.29↑11.9 years↓
"Counter target spell unless its controller pays
. this card deals X damage to that spell's controller."
Offering to Asha86%
$0.09↓#26250↓0.24↑17.3 years↑
"Counter target spell unless its controller pays
. You gain 4 life."
Rethink85%
$0.10↓#23000↓0.38↑26.3 years↑
"Counter target spell unless its controller pays
, where X is its mana value."
Thassa's Intervention83%
$0.41↑#7149↑0.216.6 years↓
"• Counter target spell unless its controller pays twice
."
Revolutionary Rebuff82%
$0.11↓#22085↓0.40↑9.9 years↓
"Counter target nonartifact spell unless its controller pays
."
Spell Syphon82%
$0.11↓#20440↓0.29↑18.3 years↑
"Counter target spell unless its controller pays
for each blue permanent you control."