While vigorously fighting False Gods, I notice every couple of matches while activating Hourglass or Sundial and sometimes just while drawing regularly. My card will be invisible and I can't activate it or get rid of the card, unless I draw the maxiaum amount of cards {8} and discard it. Which means if it's a important card essential to my strategy like Otyugh I will never be able to use it and means automatic lost against a foe thats already very difficult.
Post if the same happen to you I guess...