While playing MTG Arena on my Verizon Phone, I played the new Joshua, Phoenix's Dominant as my commander on brawl, Flipping said card (on the Phoenix side) caused the rest of my Phoenix cards (I'm playing a typal Phoenix deck!) to also exile themselves and return. Not only that but also caused my other Phoenix cards to also deal damage on saga chapter 1 (I don't know about saga 2 though, I noticed this bug once, while the exile bug I witnessed twice).