Hearthpwn

This is the burn mage deck I will be playing once the expansion hits.

You may notice there aren't many Boomsday cards in it. This is because the deck works quite well as is, and any card you add needs to work at least as well as what you remove, or add something the deck was lacking.

The big change is 2 x Cosmic Anomaly for 2 x Lifedrinker. It is a marginal call: Lifedrinker does 3 damage and is a 3/3 body for 4 mana. CA should give you at least 4 extra damage the turn you play it and is a 4/3 body for the same cost. You may argue that the 3 health you get from Lifedrinker is more valuable, but I think it'll be balanced out by CA acting as a "soft taunt", the opponent will have to kill it, while they can ignore the 3/3.

The other change is 1 x Research Project for 1 x Arcane intellect: Saving one mana is great, drawing 2 cards for 1 mana when Apprentice is down is even better, and as an agro deck we generally don't care too much that the opponent draws too. If you can use it to make a Druid overdraw right after Ultimate Infestation, even better.

I've also added Luna on a provisional basis. There have been matches where my hand has run dry past turn 8 and Aluneth is nowhere to be seen, I'm hoping Luna can act as the bridge in those cases, increasing the deck's overall consistency and therefore viability. Time will tell. 

Unfortunately I had to cut Pyroblast, as removing anything else was weakening the deck during the early/mid game, much more of a priority in my opinion.