I played a Pioneer Event match and noticed a bug.
Shortly speaking, a Supreme Verdict didn't work on a Valgavoth, Terror Eater.

My opponent had, i believe, only two nonland permanents on the field: a Valgavoth, Terror Eater (having exiled a few of my stuff a turn earlier) and an Atraxa, Grand Unifier. I cast a Supreme Verdict, but it only destroys Atraxa, leaving Valgavoth untouched. I suppose it had something to do with the replacement effect mechanics or whatever, but I'm pretty certain it wasn't supposed to work this way. Valgavoth doesn't prohibit board wipes as far as I'm concerned.

Sadly, i didn't take any screenshots of the match.