You are casting the spell for its mana cost, which is XWUU. Since X is chosen upon casting the spell, you can choose a value for X. Only cards that allow you to play the Sphinx's Revelation
without paying its mana cost set the value of X to 0.
October 29, 2014
7:56 a.m.
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Boza says... Accepted answer #1
You are casting the spell for its mana cost, which is XWUU. Since X is chosen upon casting the spell, you can choose a value for X. Only cards that allow you to play the Sphinx's Revelation without paying its mana cost set the value of X to 0.
October 29, 2014 7:56 a.m.