Hearthpwn

Mulligan for Kabal Lackey, Medivh's Valet, and any spell. However if you have Babbling Book don't toss him out as you don't know for sure your going to get Kabal Lackey and those are the only two 1 drops in this deck. (3 if you count that there is 2 babbling books)

When using Kabal Lackey with multiple spells in hand, one of them being Ice Block, use Ice Block during early game to have a guaranteed 3 damage on your 2x Medivh's Valet cards.

Youthful Brewmaster has synergy with Medivh's Valet, or any really good battlecry minions that get summoned via Firelands Portal. Lastly, I have used Youthful Brewmaster to guarantee 2 Atiesh By returning Medivh, the Guardian. You can never be too careful with good players running Acidic Swamp Ooze.

Don't be afraid to use your Sorcerer's Apprentice's as meat shields, I tend to use them instead of their real purpose seeing how low on minions this deck actually has. I know the enemy will do anything to try and get rid of them.

I have changed Doomsayer with Archmage Antonidas back and forth for quite some time but I always feel like Doomsayer is a better card because of the new Pirate meta.

Lastly, when discovering spells from Ethereal Conjurer, always go for Pyroblast unless you are in a sticky situation that requires something else. You don't know how many times I have played people who forget about that card and dont counter it.