Spell Rupture

Instant    (CMC:2)

Counter target spell unless its controller pays , where X is the greatest power among creatures you control.

"Like water, mana will drain from an inferior vessel." —Jalan Tosk, Simic forcemage

52 GTC • ENKev Walker

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Legal in: Modern,Extended,Return to Ravnica Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Tribal Wars Standard,Classic,Singleton 100,Commander

Oracle Text (click to copy):

Spell Rupture {1}{U} Instant Counter target spell unless its controller pays {X}, where X is the greatest power among creatures you control.

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1/24/2013
The value of X is the greatest power among creatures you control when Spell Rupture resolves. If you control no creatures at that time, X will be 0. The target spell's controller can choose to pay  (simply by indicating he or she wishes to do so). That player can also choose to not pay  and the spell will be countered.

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