Spell Rupture 

Instant
$0.16 #11658 0.25 13.7 years
Counter target spell unless its controller pays
, where X is the greatest power among creatures you control.
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Repulsive Mutation94%
$0.71↑#2802↑0.172.7 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%
$0.15↓#21300↓0.10↓20.5 years↑
"Counter target spell unless its controller pays
. You gain X life."
Mindswipe86%
$0.33↑#14900↓0.13↓12.1 years↓
"Counter target spell unless its controller pays
. this card deals X damage to that spell's controller."
Offering to Asha86%
$0.07↓#26456↓0.00↓17.5 years↑
"Counter target spell unless its controller pays
. You gain 4 life."
Rethink85%
$0.13↓#23354↓0.43↑26.4 years↑
"Counter target spell unless its controller pays
, where X is its mana value."
Thassa's Intervention83%
$0.35↑#7202↑0.11↓6.7 years↓
"• Counter target spell unless its controller pays twice
."
Revolutionary Rebuff82%
$0.11↓#22359↓0.1910.1 years↓
"Counter target nonartifact spell unless its controller pays
."
Spell Syphon82%
$0.11↓#20623↓0.2918.5 years↑
"Counter target spell unless its controller pays
for each blue permanent you control."