I had a very strange evening. In addition to several bad losses that convinced me that my Druid deck needs reworking, and a few other moments where I went "wait, why do I have that in my deck still?" I also had a couple of really fun games where very unlikely things worked.
First, a priest game where I ended up with a 20/9 Gurubashi Berserker, and managed to hit my opponent in the face with it. Normally I wouldn't go for something so risky, but he'd already been on the field for a while, and took down some smaller minions, so when I had the chance to do that much damage with just four cards and 9 mana, I took it. Started that round at 9/4. Power Word: Shield, 2 mana up to 6 health. (Northshire Cleric that I drew from that, nice bonus.) Heal for 2 mana up to 8 health. Voodoo Doctor for 2 Mana up to 10 health. Divine Spirit for 2 mana takes me to 20 health. Then 2 mana brings out the Crazed Alchemist, swaps the health and mana, making him 20/9, ignore the two weak minions on the field and take my opponent from 26 down to 6. He then plowed four little minions into the beast in order to kill it, but that didn't even buy him another turn because I used Holy Fire and my remaining minions to take him out.
Then there was my Shaman match where I got some bad card draw, but my opponent must have had worse. I ended up using a Flametongue Token with no shield minion out, and later using my Windspeaker to give Windfury to a Healing totem. Used that healing totem to hit the enemy in the face a few times and take out two minions before my opponent unexpectedly left the match. Craziest way I've ever happened to maintain board control.