Hearthpwn

Played this list from Platinum 10 to Legend in Wild. I don't use a deck tracker, so no stats available (sorry) but had a surprisingly low amount of losses, maybe 5 in total.

This particular build is heavily oriented towards putting huge minions on the board throughout the game, as well as having enough survivability against aggression.

General mulligan tips:

Vs AGGRO - Defile, Nether Breath, Darkbomb, Hellfire. Keep Lesser Amethyst Spellstone only if you have Vulgar Homunculus as well.

Vs EVERYTHING ELSE* - hard mulligan for Mountain Giant. If you already found one, look for another one! Otherwise, Twilight Drake and Twilight Guardian are decent keeps.

*Secret Mage is this deck's worst matchup. If you know you are up against a Secret Mage, you really want to look for Molten Giant and Hooked Reaver as they are the two cards that benefit from having low health (we all know how Secret Mage games tend to play out). The way you win is by having huge threats that they simply can't deal with, and then hitting them in the face before they burst you down.

Try to manage your hand size whilst also using the discounted Life Tap every odd-mana turn. Play your threats, but try not to overcommit into a possible AOE; for example Zephrys the Great into Shadow Word: Ruin.

Some alternate strategies include using double Darkbomb + double Nether Breath for 14 points of burst damage, and dropping Mojomaster Zihi to stop an enemy combo deck from popping off. I used this multiple times against Reno Priest and against the lone Togwaggle Druid player I ran into.