Hearthpwn

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30 upvotes = full guide.

Mulligan:

always keep: Dire Mole or Fire Fly or Helpless Hatchling -> Untamed Beastmaster or Pyromaniac (other 3-drops are fine but slightly worse)

vs aggro: Arcane Missiles, Daring Fire-Eater

vs control: Arcane Intellect, Black Cat, Stargazer Luna

when you have good mana curve keep: Jan'alai, the Dragonhawk, Corridor Creeper

Cards replacements:

Leeroy Jenkins -> Clockwork Automaton  (it's super hard to replace this card because it's the best finisher in game but Clockwork will allow you to deal more points of dmg with hero power and you don't have to care about taunt minions)

Stargazer Luna -> Acolyte of Pain (different way to draw cards, you can just play this for tempo and still get cards but in 'late game' Stargazer Luna is better because you can cycle a lot of cards)

Nightmare Amalgam -> Jungle Panther or any other 3 mana beast (another great beast that fits into aggro deck because you will almost always have guaranteed 4 points of face dmg)

Cards that might be included:

Frost Lich Jaina - it might not be the best card to include in aggro deck but it might add a late game win condition and generate more value (Water Elemental). Lifesteal from water elementals can help against aggro decks.

Kirin Tor Mage feat. Explosive Runes / Counterspell - it might weaken synergy with beasts but those are really good cards that fit into aggro

Ornery Tortoise - when you are aggro deck you don't really care as that much about the health total unless you play against other aggro deck. This means that we can take advantage of it and include great 3 mana beast.

Vicious Fledgling - when you will have an option to hit opponent face, pick windfury = profit

Clockwork Automaton - deal more points of dmg with hero power. It also synergies with Daring-Fire Eater