Bear in mind, however, that surge only reduces the amount of mana you pay, not the spell’s converted mana cost. So a counterspell like Disdainful Stroke that cares about converted mana cost will see any value of X as counting double toward converted mana cost, which means that it can counter Fall of the Titans for X=2 even if you only paid three mana for it! On the other hand, if you can amass a monstrous amount of mana behind your spell, that can make it much harder to counter by effects like Kozilek, the Great Distortion. Even Kozilek can’t stop a Fall of the Titans coming his way for any value of X that equals 8 or more, because there are no cards (at the time of this posting) with a converted mana cost of 17 or greater!
Today’s Rules Tip written by Jen Wong