Hearthpwn

The base for this deck seems pretty solid. You have early-game minions that are annoying to deal with. Additionally, you have stall and recovery in the form of Jinyu Waterspeaker and Feral Spirit as well as efficient removal options. You also have a total of 16 Overload, so you're definitely not short of Overload enablers.

However, there are a "few" changes I would consider. The first is removing both Feral Spirits. A big reason for this is you're not running Flametongue Totem, which is often played the turn after. And, based on this deck, it seems you're not trying to set your opponent to zero as fast as possible but rather trying to reach the late game when you overwhelm with the sheer number of threats. So, you neither need to push that early damage nor do you need two 2-3 Taunts, which is pretty mediocre from a defensive standpoint. I would sub in Tar Creeper as it's one of the best defensive options, counts as an Elemental, and doesn't set you back two mana.

Speaking of being set back on mana, I highly, highly recommend finding a place for Eternal Sentinels or Lava Shocks. Eternal Sentinel is generally better since it can be played proactively, but a pair of Lava Shocks being six hundred dust cheaper is something to consider. From personal experience, I can say playing an Overload deck with and without Overload removers are completely different experiences. I stand by what I said in that I wouldn't play Overload and Elementals in the same deck and in extension those cards, but for the sake committing to the Overload theme, I can't recommend Eternal Sentinel and Lava Shock enough.

Jinyu Waterspeaker is a fine card, but one should be enough considering you'll have the early game on lockdown a lot of the time, and you won't be bleeding too badly most of the time. I would also cut out Blazecaller since you're running Ragnaros. Yeah, Rag is... well, Rag, and he and I don't have the best history, but aside from his aim, he's a continuous, stronger Blazecaller for one mana more. Plus, you have Servants of Kalimos to fish for Blazecaller. I would also cut out Brann since you probably won't need the extra value from your Battlecry cards with so many threatening cards: Tunnel Trogg, Unbound Elemental, Servant of Kalimos, Earth Elemental, Ragnaros the Firelord, and Snowfury Giant. So, after cutting a Jinyu Waterspeaker, Blazecaller, and Brann; I recommend adding in another Unbound Elemental--because they really can get out of hand fast and again, are Elementals--and the two copies of Eternal Sentinel or Lava Shock.

I noticed the deck lacked card draw, and that can really hold you back. A copy or two of Ancestal Knowledge and/or Mana Tide Totem can help remedy that. Ancestral Knowledge is better when you're top-decking late-game since you'll have plenty of mana or when you want more Overload. After playing Unbound Elemental on turn three, I would play Ancestral Knowledge alongside Eternal Sentinel or Totem Golem. In an ideal scenario, your turn one was Tunnel Trogg; your turn two was Totem Golem; and your turn three was coining out the Unbound Elemental. It's not likely, but it's disgusting when it does happen. Mana Tide Totem is more consistent and can potentially get you more cards, and if your Mana Tide of all things eats removal, you're not too sad. Other than that, I'm confident you'll be able to overload your opponents early on and snowball to victory, Lothlorien.

So, to recap:
- 2x Feral Spirit
- Brann Bronzebeard
- 1x Jinyu Waterspeaker
- Blazecaller

+ 2x Tar Creeper
+ 1x Unbound Elemental
+ 2x Eternal Sentinel or 2x Lava Shock

Optional + 1x/2x Ancestral Knowledge and/or Mana Tide Totem swapped for a card/cards of your choice
I recommend - 1x Rumbling Elemental and/or - 1x Snowfury Giant