I had this game quite recently in the "Desecrated Tomb" where we (4 heroes) would spam immobolize the lieutenant in the first room and maintain the fight in such a way that it never reached the dragon chamber. However, the overlord had in the first encounter managed to draw almost all cards in his stack of 16 cards, which rendered him able to play a certain card with some other cards, reshuffle the deck, and almost instantly pick the same card again almost every other round. The card in question that felt overpowered this time was the one that grants a specific monster 2 red dies in health back. He used like every 3rd turn, and we could almost never get the boss monster down.
Is this intetional? I mean, what the hell happens with reinforce ????