Invisible Card
Card drawn off the deck was invisible.
Best of 3 direct game
First card drawn was invisible to me for the rest of the game. I managed to interact with it in my hand moving it/discarding it, but I was unable to actually see what it was.
Opponent reported that the card stuck to their screen, appearing in their deck when they searched.
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InsectileAberration#69687 commented
I had a similar problem with invisible cards in my ranked historic match. In game 2 my opponent mulliganed to 4 based on the graphic showing when I mouse over their library, but visually it showed them with 5 cards plus their companion with a gap between cards 2 and 3. Then in game 3 my opening hand contained an invisible card that I could only see what it was by right clicking where it was supposed to be. It seemed I could sort of interact with it, but then when I tried to cast it by double clicking it my mana was spent and nothing happened.