I don't like Theotar

I have been playing a shaman deck with the “command the elements” questline due to the new overload support card from the latest expansion. I don’t expect to win much with it, I’m just doing it for fun. After a few games I finally completed the questline for the first time. The very next turn my opponent played “Theotar the mad duke” and took my “Stormcaller Bru’kan”. I didn’t even expect to win this game after playing my questline reward, but having it taken from me after all that time feels really bad. Please do not make cards like Theotar in the future, it makes it unfun to play the game.