This has happened a few times to me but I haven't had the presence of mind to screenshot it. The bug is, I have 7 cards, I draw another card, but as the animation puts it into my hand, the card disappears, and I can't play it. Furthermore, when I try to end my turn, it says I have 8 cards, including the card that vanished as it was going into my hand, and I'm forced to discard one of the cards I CAN see.