Spell Rupture

Text:

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

Rulings:

• 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 <img src="/Handlers/Image.ashx?size=small&amp;name=0&amp;type=symbol" alt="0" align="absbottom" /> (simply by indicating they wish to do so). That player can also choose to not pay <img src="/Handlers/Image.ashx?size=small&amp;name=0&amp;type=symbol" alt="0" align="absbottom" /> and the spell will be countered.