Hearthpwn

Lets see how powerfull is an off meta deck. This deck works on its own since it's 90% elementals. This means that the elemental chain works on every turn. All you need to do is keep the tempo on your board until your opponent has no chance to react. Here some tips:

- Mulligan is an easy case. Always prefer low-cost cards regardless of the matchup.                   Notice if you go against Treant Druid, Mech Rogue, Excavate Paladin etc. you should keep Glacial Shard to freeze the board for as long you can. (Cold Storage is a great defence option too) If you go 2nd best start is Coin - Flame Revenant - Shale Spider/Amalgam of the Deep. 

At this point you should keep playing tempo. And here we will see in detail the use of each card:

Cold Storage: Use it to freeze some big enemy minions against agro like Rogue,Paladin,Druid etc. or if you have better survivability use it on Skarr, the Catastrophe to get an extra copy in your hand. Never keep on mulligan.

Glacial Shard: Freezing tool to slow the agro mutchups. Not best option for turn 1 play unless you dont have Shock Hopper and you got Shale Spider or Amalgam of the Deep. Keep on mulligan against agro or for necessary turn 1 play.

Shock Hopper: Best turn 1 play without Coin. Always keep on mulligan (unless you have Coin with Flame Revenant). 

Amalgam of the Deep: Some of the best pickups Skarr, the Catastrophe, Living Prairie, Al'Akir the Windlord,Walking Mountain. Keep on mulligan.

Flame Revenant: Keep on mulliga if you have Coin +best option for turn 2 play. Always keep on mulligan.

Menacing Nimbus: Best turns to play 2-4. Keep on mulligan.

Saloon Brewmaster: Only target Skarr, the Catastrophe. (back to back Skarr = win). Never keep on mulligan.

Shale Spider: Best turn to play 2-4 same as Nimbus. Always keep on mulligan.

Trusty Companion: Best targets Flame Revenant, Brass Elemental. Never keep on mulligan.

Minecart Cruiser: Best 3 turn play or 2 with Coinfor value trade. Keep on mulligan.

Brass Elemental: Best 4 Turn play or 3 with coin same as Minecart Cruiser. Keep on mulligan.

Living Prairie: Best turn 5 play or 4 with coin same as the others. Keep on mulligan with Coin or against agro.

Golganneth, the Thunderer: 1st abillity draw 3 overload cards is the most useless. 2nd Deal 20 damage to an enemy minion. Best targets is Titans or minions with 10+ health. 3d Deal 3 damage to all enemies and heal 6 to all friendly characters the most value abillity. Clear+Survivability. - ALWAYS - play it after 7 turn with some 1- or 2- cost elemental. Never keep on mulligan.

Stone Drake: One off just to have some survivability against agro but not important tool for this deck. Not turn 6 play necessary unless you dont have other elemental for chain. Feel free to replace it withAl'Akir the Windlord. Never keep on mulligan.

Skarr, the Catastrophe: Obviously win condition. Play it for survivability if your opponent have big board. Best use - Freeze the game until Skarr do 10-12 or pluse damage. - ALWAYS - play it with Saloon Brewmaster or Cold Storage. Keep on mulligan if you have enough early game (1-2 cheap elementals).

Therazane: Play it as soon is posible. Best turn 6 with Coin. Do not use Cold Storage on this. Get full value if you have big discovered elementals to your hand. Keep on mulligan if you have enough early game (1-2 cheap elementals).

Azerite Giant: Fast play on turn 4-5. Combine it with Flame Revenant is pure pressure. Best value - after Therazane dies with double stats. Never keep on mulligan.