Hearthpwn

Played this on wild ladder since the start of the expansion and it got me from Diamond 10 to Legend very quickly. Currently, it basically wins against all opposing decks in high legend.

Mulligan:

• Always keep any spells that deal damage in your hand
• Most of the time, switch out Tracking and Flare
• Always get rid of any minions you draw
• If you draw a ton of 3-cost damage spells, consider removing one

Gameplan:

• Try to use your hero power every turn, use your hero power to fill in your curve
• Try to play Kill Command and On the Hunt or Wound Prey on the same turn
• Remove dangerous minions (i.e. Darkglare) immediately
• Auctionmaster Beardo is best used after your hero power becomes 0
• Glacial Shard is best saved for large minions (i.e. Flesh Giant and Blightborn Tamsin)
• Beware Dirty Rat, plan your quest completion accordingly
• Most of the time, you win against your opponents before you get your final quest reward online, just point face

Special Scenarios:

• If you have Toxic Reinforcements in your opener, you can play it before the questline if you are low on damage-dealing spells
• Powershot can be used to immediately activate your Leper Gnomes from the sidequest

Good Match-ups:

• Darkglare Warlock - remove darkglare and lifesteal minions, do not kill Crystallizer or they will complete the quest too fast with Raise Dead
• Murloc Shaman - remove all of their minions
• Pirate Warrior - remove all of their minions
• Most slower decks

Bad Match-ups:

• Anything with immense healing or armor gain

EDIT: Switched out Blackwald Pixie for Coldlight Oracle.