Five: Poor randomness
We all have those times where your opponent plays an Unstable Portal, pauses to ponder their life, and then plays Captain’s Parrot. Or their last-ditch Imp-Losion rolled a two on your 6/3 when you have lethal in play. Or your Tuskarr Totemic gives you a Totem Golem. Randomness is a big part of Hearthstone, and bad results are fairly frequent. The new “Wow” emote is fairly good at dealing with your own bad randomness, but when your opponent experiences keyboard-breaking levels of bad RNG, there is no longer a way you can tell them how Sorry you are.