A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
RE: This.
Pardon me, but I believe the above answer is incorrect.
Aren't both the asker and answerer overlooking the fact that the Spell itself has the Fire keyword? Even a Shugenja with no keyword of his own alone in an army can cast it to some effect. Is there some reason/ruling that the Spell's action's keyword is not counted? That it IS counted seems to be implicit with the Spell's own wording "one or more".
RE: This.
Pardon me, but I believe the above answer is incorrect.
Aren't both the asker and answerer overlooking the fact that the Spell itself has the Fire keyword? Even a Shugenja with no keyword of his own alone in an army can cast it to some effect. Is there some reason/ruling that the Spell's action's keyword is not counted? That it IS counted seems to be implicit with the Spell's own wording "one or more".
Perhaps the original poster was assuming that some card effect removed the Fire keyword from the spell.