@kenkagejack
Well, apparently Randy CAN use multiple elements (wind, water, ice), but that precludes him from using fire (since it opposes water and/or ice, it's kinda unclear). Even if we don't get the full details of the magic system, what he said seems appropriate.
Ice might be designated as "unaffiliated" [see page 30, bottom right panel], but the point still stands.
Nonetheless, there seems to be a veritable cataclysm in the comments about how/why all this magic stuff should/shouldn't work, so I'm just gonna say "We should wait and see what happens next."