Hearthpwn

If you are still feeling frustrated about this brawl, don't worry. Since it is a brand new brawl, it is okay during "New Meta". Hopefully the following tips may help you.

Tip 1: Recommend to build your deck around 15 cards. The main purpose of this brawl is to get synergy around the Shadow Reflection, so we need to make a good use of those cards.

Tip 2: Any cards with mana reduction is good. Mana reduction helps you play the same cards in your hand with more efficiency and less time.

Tip 3: Watch the order of the cards, because Shadow Reflection will change if you play a different card. Think before you act (just like a pro!) 

If you have any other tips, or improvements, comment below. We strike to make a better game experience.

Some suggesting decklist

Radiant Elemental Mindblast OTK Priest Deck by MagicKnight - Jan 10, 2018 View Deck String Export to BBCode Export to Cockatrice Export to MarkDown Export to Html Clone this deck
Minion (4) 2x Radiant Elemental 2x Novice Engineer	Ability (6) 2x Shadow Visions 2x Mind Blast 2x Power Word: Shield
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Combo: Radiant Elemental + Mindblast
Best case: Turn 4 Radiant Elemental + Shadow Reflection + Mindblast + Shadow Reflection*5
Watch for Warrior and Druid because they have armor gain, need extra Shadow Reflection(s) for lethal.

Flamewaker + Mana Wyrm Spellpower Tempo Mage Deck by MagicKnight - Jan 10, 2018 View Deck String Export to BBCode Export to Cockatrice Export to MarkDown Export to Html Clone this deck
Minion (6) 2x Flamewaker 2x Mana Wyrm 2x Sorcerer's Apprentice	Ability (6) 2x Ice Lance 2x Arcane Intellect 2x Frostbolt
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can replace Frostbolt and Ice Lance with Arcane Missiles
can add Animated Armor for counterplay
Combo: Flamewaker + Sorcere's Apprentice + Arcane Missiles

Mechwarper + Metaltooth Leaper Unknown Deck by MagicKnight - Jan 10, 2018 View Deck String Export to BBCode Export to Cockatrice Export to MarkDown Export to Html Clone this deck
Minion (6) 2x Metaltooth Leaper 2x Mechwarper 2x Stitched Tracker	Ability (2) 2x Tracking
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Combo: Mechwarper + Metaltooth Leaper
Best case: Turn 3 Mechwarper + Shadow Reflection*2 + Metaltooth Leaper + Shadow Reflection *3

Counterplay

Armor Counterplay to Mindblast Enrage Warrior Deck by MagicKnight - Jan 10, 2018 View Deck String Export to BBCode Export to Cockatrice Export to MarkDown Export to Html Clone this deck
Minion (4) 2x Armorsmith 2x Drywhisker Armorer	Ability (9) 2x Dead Man's Hand 2x Battle Rage 2x Iron Hide 2x Shield Block 1x Whirlwind
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Shield Block and Iron Hide can delay the timing from Mind blast

I came up with something very similar for Mech Hunter, but I think you don't want to run Micro Machine in that slot. I had Quick Shot instead and was liking that result. With 4 minions the Stitched Tracker will get you either the one you're looking for or another Stitched Tracker (so you can eventually find Metaltooth Leaper or Mechwarper, whichever you need) but you might have to cast multiple Trackers. I think it's better to guarantee you can get the Turn 3 Mechwarper army into Turn 4 Tracker+Leaper, or the Turn 3 Tracker into Turn 4 Mechwarper army. You cut the odds of each of those lines working in that time-frame from 100% to 75% by including a 4th minion.

For Priest, I think a better combo list can be built around Inner Fire: 
2 Radiant Elemental
2 Power Word: Shield
2 Guild Recruiter
1 Inner Fire
2 Shadow Visions
Optionally: 1 Kabal Songstealer (the cheapest silence that doesn't interfere with recruiter or visions, ultimately I cut him for another shadow reflection)

The idea is to cycle through your whole deck with Power Word: Shield and then double the :minion's attack.

This list has minimal cycling pre-combo, but is able to go off with a single Guild Recruiter, ending the turn with a 30/30 and a 20/20 (or so, you run out of cards in your deck eventually). The optimal goldfish is a little faster than Mind Blast priest and the consistency should be higher since you have effectively 4 copies of Radiant Elemental. The downsides are that the board matters and that you have to wait for a minion to attack without charge. (So this is partially an anti-combo combo deck)

For the Mind Blast deck I think you want to load up on cycling a little more, but that's really just a point of fine-tuning and not that critical.

Other decks I think have good potential:
Quest Rogue (probably running some 0-mana minions and possibly running Preparation or Counterfeit Coin for the 5-mana quest card)
Token Druid (the ideal finisher is probably Mark of the Lotus)

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As far as I'm aware, Mechwarper is the only thing that can really be considered a 1-card combo (with Shadow Reflections) and even filling the board on Turn 3 and killing on Turn 5 is reasonable (with two hero powers). Between Tracking, mulligans, and Stitched Tracker, this deck is a lot more consistent than it looks on paper. I think this is the best deck in the brawl format. My preferred list cuts the Micro Machine from the above post and replaces it with Quick Shot.

I think the main contender against attack-based aggro/combo decks are the token or swarm aggro decks. I think these are kind of a weak natural predator that can potentially race or contest the board. Some of these decks include cards like Consecration or Lightning Storm, so they can potentially clear a board of 3HP minions with a little help from their own aggro minions.

Finally, the pure combo decks like Mind Blast Priest are trying to ignore the board and kill the opponent. All that interferes with Mind Blast priest (to take one example) is armor gain and a few secrets, so except for teching in those strategies, it's a straight race. Mind Blast priest is therefore weak against aggro/combo but generally strong vs pure aggro (which is a little slower IMO). Consistency in terms of how quickly you can race is the key thing here.

 What about Big Druid? I'm at ~20 wins so far - very fun deck especially Kun > Kun > Kun > Y'saarj combo :)

BRAWL: Big Druid Ramp Druid Deck by Unthahorsten - Jan 12, 2018 View Deck String Export to BBCode Export to Cockatrice Export to MarkDown Export to Html Clone this deck
Minion (10) 1x Chillmaw 1x Kun the Forgotten King 1x Ragnaros the Firelord 1x The Lich King 1x Y'Shaarj, Rage Unbound 2x Primordial Drake 1x Greedy Sprite 2x Ironbark Protector	Ability (15) 1x Ultimate Infestation 2x Innervate 2x Nourish 2x Naturalize 2x Jade Blossom 2x Wild Growth 2x Wrath 2x Swipe	Playable Hero (1) 1x Malfurion the Pestilent
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