http://archive.pegforum.com/viewtopic.p ... 43#p354243
Clint Black wrote: Counterspell:
A character with a AB (Magic or Miracles) can choose to take a Counterspell action, rolling their arcane skill. The caster can then choose to apply the result of that roll as the base TN for any other casting attempt within 2x Smarts inches until the beginning of their next action.
The caster must make this decision before the spell is activated, and then must spend an equivalent number of power points as the spell being used. If the caster does not have enough power points, the Counterspell does not work and they lose their remaining point.
Counterspell counts as a normal use of the arcane skill, which means it cannot be combined with another use of that skill, such as casting a spell of their own.
Then I'd like have a couple of Edges to affect it. Perhaps one that lets the caster cast and counterspell at the normal MAP, and another to remove the penalty for combining the two.
Also this version allows any magic to counter any magic. If you wanted to add a "the caster must have a power with a trapping that could counter the opposing spell," maybe add a +2 to the roll to cover the fact it might not work at all.
Or perhaps keep it so any spell can counter any other, but if the trappings would oppose each other, the spell being activated suffers a -2 to the roll.