The Boss Jythiros of Questions in the tomb Khartut’s Tomb on Heroic mode, keeps playing cards that were not offered as an option to his riddle (special power).
For instance he gives the option of 4-5cards (Treasure A,B,Draw 3 cards 6armor,Loatheb) and regardless of the choice, he plays something completely different like Ragnaros the lightlord.
This kept happening turn after turn.
In my run I had the Glyph of Warding (Enemy minions cost (1) more mana), so maybe that bugs something out. No anomalies active.