Did they patch out Serafen gibbing himself or the rest of the team on unlucky Wild Mind rolls at some point? I've used him through the main story on Normal difficulty pretty extensively and aside from maybe one or two enemies turning invisible, nothing bad has ever really happened.

In fact Wild Mind procs don't seem to do anything that I can identify. The combat log is mum on the subject.

(yes, I've seen the tables; what I'm saying is, those particular effects just don't seem to occur, ever, except for very rarely some enemies going invis for a short time)

So I'm nearly finished with the game on Classic mode, and Serafen has managed to turn a few enemies invisible. He's also killed Aloth once (when trying to give him Robust; oops!) and he has Disintegrated himself twice, though I'm not sure how he pulled that off. Each time he was trying to Disintegrate something else that may have had the ability to reflect Disintegrate.

In any case, he isn't anywhere near as cursed as people make him out to be. Trick seems to be to make sure he never accumulates too much Focus. If he does, bleed it out with single-target stuff to limit the backlash potential