Enemy played Aman’Thul and used its ability Strike from History which has the text Choose to enemy minions. Remove them from the game. I only had one minion on the board which he removed. But then, for some reason, a minion in my hand was also removed! And its space in my hand seemed to be there but empty. Meaning, other cards made space for it but there was no card for me there to play.
This seemed to be a visual bug at first, but later in the game this happened:
I saw 7 cards in my hand and played The Azurite Scorpion. I expected this to yield me 4 spells and a maxed out hand size of 10. BUT I only received 3 cards. At this point I realized my max hand size must have become 9, because I only ever saw 9 cards. And true enough, whenever I discarded newly drawn cards due to full hand size, I only had 9 cards.
This seems like quite a serious bug. It gave me a bad handicap for the rest of the game as my deck centered around many options and spells. I understand Aman’Thuls ability as removing minions from board only, but even if it somehow could remove a minion from my hand, it surely shouldn’t decrease my max hand size! Must be a bug!