Aggro Druid!

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General Strategy:

This is a hyper aggressive deck that centers around keeping board control so you always have minions on board to buff. Unlike Face Hunter or Stealth Aggro Rogue, this deck does want to trade a bit more in the early game to protect our minions. We don't care as much about high attack minions but rather the quantity of them. More Minions = More buffs = More damage. Because of this, the first 3 turns should consist of making as wide of a board as possible and figuring out how to protect it so your opponent can't kill your minions.

Tips:

Only use Lightning Bloom early if you're sure your opponent can't clear your minions on the next turn so you can buff them 2 turns later. It's best uses are for a turn 1 power play with Gibberling or to ramp into Soul of the Forest or a buff.
Don't get too greedy with your value/draw cards like Keeper Stalladris and Voracious Reader. Tempo is everything and if you conserve some tempo to try and get more value/draw later chances are you'll fall too far behind.

Mulligan:

Always Keep - Acornbearer, Adorable Infestation

Sometimes Keep - Lightning Bloom (if you have Gibberling + buffs), Gibberling (if going second), Beaming Sidekick (if you have Acornbearer, Intrepid Initiate), Intrepid Initiate/Soulbound Ashtongue/Treenforcements (if you don't have another 1 drop or going second and have Power of the Wild), Dreamway Guardians (if you have a 1 drop), Keeper Stalladris (if you have Treenforcements)