Re: Intercede!; Catch-all ability for defending and resisting
You say "spell", so the first question is "what magic system"? Standard magic, magic-as-powers (individual spells built out of Advantages, like super powers), one of the systems in Thaumatology, RPM, Sorcery, etc.
In few of those systems do you need a skill that can be any skill (a wildcard skill).
To make a spell an Active Defense, it generally needs a trait for that purpose. A "Blocking spell" in standard magic, or the "Reflexive" Enhancement and "Active Defense" Limitations for abilities in magic-as-powers or Sorcery. See also the "Defending With Powers" rules in Powers (p167).
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