When I was playing Battlegrounds with Infinite Toki, at the end of one of my turns, I hit the button for her Hero Power right when the fields shifted into combat. Unfortunately, the temporal portal animation that summons the minion remained in the center of the screen. You know, the black galaxy looking thing. It remained in the center of the screen for the remainder of the run, in both the buying and combat phases. Admittedly, I did not use her Hero Power again during that run to try and remove it from the screen. While not game breaking, it was annoying.