Three: Top-deck lethal
Your opponent puts you down to one life. He has a massive board, a few cards in hand, and ten life. You have nothing in play, nothing in your hand. He passes the turn. What do you draw? Pyroblast, dealing exactly lethal damage. Pulling that off is awesome, but being on the receiving end is one of the worst feelings in Hearthstone. How better to express your completely sincere remorse to your opponent than a well-timed “My Apologies”? In fact, in such an unpleasant situation it would almost be rude not to tell your opponent that you are Sorry! Now that you can only express amazement, your opponent could be under a misguided impression that you are being rude. Bring sorry back, for all times you draw the one card you need.