My opponent played steamcleaner.
Now, both me and my opp are control deck, at that time, our decks have more than 50/60 cards (due to we played Archbishop Benedictus few times), and 40/50 of them were cards that didn’t start at our decks, so naturally it took some time for the animation to reveal the cards 1 by 1.
By the time this completed, it was my turn but it only had around 5 seconds left (and until this animation completed, I couldn’t do anything).
Basically I missed 1 turn… Lost a game that have been played for 15+ mins because of this 
I don’t think this is by design, that steamcleaner animation occupied/blocked the time in the next turn(s)?