Hearthpwn

 

Sorry for the delay with the full guide, busy times at work. As it stands I'm unlikely to do the whole write up before Wednesday. Once again apologies for the wait.

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Mulligan

Always Keep

Wild Growth -  this deck is sometimes referred to as Token-Ramp Druid for a reason. Almost always this is the card you want to play on turn 2.

(Almost) Always Keep

Mire Keeper -  as already mentioned you want to ramp with this deck. Unless put against the wall with early aggression turn 2 Wild Growth into turn 3 Mire Keeper is the dream opener.

Situational

Innervate - if you already have Nourish to ramp on turn 3 or possibly 2 if starting with a coin, it depends.

Nourish - if you already have Innervate.

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Always vs Aggro

Spreading Plague - this can truly save your ass. Well, at least while it costs 5 mana.

Tar Creeper -  a nice solid early game taunt. If facing aggro don't be afraid to follow it up the next turn with Strongshell Scavenger even if it is the only card to be buffed. Vs aggro you don't need to get that much value out of your Stronshell Scavnger and if you don't survive till mid/late game then what's the point of hoarding it.

Wrath - kill some pirates and draw 1, kill Murloc Warleader.

Swipe - would keep as you only have one copy and it truly could come in handy.

Situational vs Aggro

Innervate - assuming you have Spreading Plague. Enjoy it while it lasts, the card is about to become absolute unplayable garbage.

Vs Agrro If you don't have Spreading Plague and Innervate or Tar Creeper

Keep this cards in this particular order starting from most and going on to least preferred.

Druid of the Swarm - it goes without saying that in this match-up you'll usually play it as a taunt.

Power of the Wild - as already mentioned you'll be fine without getting best value out of your buffs in these match-ups, thus playing the card as a Panther is okay and in fact might be necessary in order to ensure survival.

Crypt Lord - again, though in other match-ups you might want to get more value out of the card, vs aggro your first and foremost imperative is to survive the early onslaught.

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Always vs Control

Nourish - in these match-ups even without Innervate.

Crypt Lord - there's some small chance you'll get it to spiral out of control early on if your opponent fails to deal with it.

If you want me to write more specific mulligan guides for each of the most prominent decks e.g. Jade Druid, Aggro Druid, Mid-Range Murloc Paladin, Highlander Priest, Big Priest, Pirate Warrior and Deamonlock please don't foregt to say so in the comments.