Well, if for no reason other than to keep the conversation going, are we assuming any number of "standard" spells that our Masters can use? Things that they'd all be expected to know as part of their basic training as magi that wouldn't necessarily merit mentioning in their skillset, like hypnosis (used by Waver and Kiritsugu) or healing magic to tend to your Servant's injuries (used by Irisviel and Kayneth). I'd imagine basic Bounded Fields and creating a familiar would probably also fall under the category of "standard skills" (not Reinforcement, however, despite the common misconception, as it's only really useful to the degree seen in F/SN when used by people who either specialize in it like Shirou or people who are ridiculously gifted mages like Rin or Luvia).

What do you think, [@vancexentan]? Everybody?