I've noticed a bug with certain cards in the Hlaalu deck. These are cards where you can acquire another card for free from the Tavern if you get a combination. When you play one card like that, then play a second card which is also like that, such that you get a combination and should be able to acquire two separate cards from the Tavern-- one from the first Hlaalu card, and another from the second Hlaalu card-- often you are prompted to acquire one card but afterward the prompt to acquire another card doesn't come up as it should, even if there are qualifying cards in the Tavern (meaning they do fit the necessary criteria about their cost).
I've fought mudcrabs more fearsome than me!