The last two Battlegrounds updates (Patches 23.2 and 24.2) that followed an expansion release contained a Heroic Brawliseum which was then followed up by a Mini Set reveal. Will it happen three times in a row? I guess we'll find out this week.
I'm really not sure why I bother playing ladder when most of my deck building and/or strategy is rendered useless just because my opponent or myself plays this card. It's hard to comprehend how this costs 4 and Mutanus costs 7.