Way to Create Random Effects in Spells?

Not as far as I know. You could make 3 things rare, but that wouldn't make them mutually exclusive

That is too bad, they really need that ability.

One of many improvements the magic system desperately needs.

Isn't there a way to check a random integer and use a series of if/then statements based upon what number came up?

I think this is something that will only be achievable once the API is released.

There are no random integers, and there are no if/else checks.