Hearthpwn

Also known as APM Mage. Refreshing Spring Water really pushed this deck over the top! I went 20-6 with it on my climb to legend in April and the deck feels really powerful as it can consistently OTK any opponent, sometimes as early as turn 5! All you got to do is draw an Incanter's Flow, a Flamewaker, a Sorcerer's Apprentice and some card draw and go wild! An early Conjure Mana Biscuit can act as a mana bank to allow the combo to go off as early as turn 5 sometimes.

Always mulligan for: Incanter's Flow (the most important card to find early), Flamewaker (that's your win condition) and card draw. With a Flamewaker in hand, cards like Primordial Glyph or Conjure Mana Biscuit are good keeps versus aggro as they can be cast early to set up a 'mini-miracle' turn on turn 3 or turn 4 to clear the enemy board and leave behind a Flamewaker that they need to somehow answer. I also like keeping Refreshing Spring Water as it is usually a 0-mana draw 2 and if not it means that you probably drew some key minions. Versus slow decks, Arcane Intellect is also a fine keep.

The deck really destroys slow decks like Reno Priest, Big Priest, Control Warlock, Renolock and so on. It does very well against aggro because of the possibility to use Flamewaker for an early board clear (instead of sitting back and waiting to assemble an OTK combo). They often have no way to kill it then and it is game over. And even if they do you keep drawing through your deck for the 2nd one and if you find him early enough you will now have more than enough mana to kill them.

There are 2 bad matchups only. Darkglare Warlock (which I barely see these days post-rotation and even less after the Pen Flinger nerf) as we don't run too much freeze and Secret Mage as we only run 5 minions in this deck and Explosive Runes really destroys us (we have to sacrifice either an Apprentice or Luna as well as its mana cost to proc it so that we can play a Flamewaker on a later turn while hoping they don't put their second copy of the secret up there). Still I went 2-2 vs them so it is still definitely winnable

Stargazer Luna is also a great card in this deck, especially if you have cast 1 or 2 copies of Incanter's Flow. She is effectively a 3-mana Auctioneer that can draw your whole deck

Some similar decks don't run Runed Orb, but I really like the card. The only cards I'd consider cutting are Arcane Missiles. They can be useful as a bit of extra damage to manage an early OTK, but depending on how the meta is it might be more useful to add one Ice Block and a copy of Ancient Mysteries (if you face a lot of mirror matches for example). Or maybe Icicle for some more card draw possibility