I played a couple of matches as Ashiok against bots to do missions and noticed in different games multiple times that when the opponent draws a card at the start of its turn, there's a notification about x2 nightmares attached to a card, but 3 hp is drained afterwards. I used a deck with Warlock class and by the time i noticed the bug, i had it fully leveled up. Maybe this is irrelevant but it's the only change i made to a deck after game update