Hearthpwn

73% win rate at rank 20. (out of 11 games)

So, this is a themed beast hunter deck using only basic cards. It can go face, or it can be control until it can go face. You just need to feel out the opponent and decide which to go. 

Mulligan - Arcane shot, 2 mana beast, 3 mana beast, 4 mana beast. 

You want to save timber wolf and stonetusk if possible for 7/7 turn or more so you can draw a card with Starving buzzard. Gain board control with arcane shot/multi shot.

Un'goro Upgrade v1.0 for 520 dust:

-2 Arcane shot, +2 Jeweled Macaw
-2 Bloodfen Raptor, +2 Crackling Razormaw
-2 River Crocolisk, +2 Scavenging Hyena
-2 Razorfen hunter, +2 Pterrordax Hatchling
-2 Core Hound, +2 Volcanosaur

Mulligan - Jeweled Macaw, Crackling Razormaw, Animal Companion, Scavenging Hyena

Always play a 1 drop if you go first or if opponent doesn't play a 1 drop first so you can buff with Razormaw or buff scavenging hyena. Keep other 1 drops for turn 7 or 8 if possible so you can draw cards with Buzzard.

Un'goro upgrade v1.1 Poison buff

-2 Jeweled Macaw, +2 Stubborn Gastropod
-2 Pterrordax Hatchling, +2 Giant Wasp 
-1 Tracking & - 1 Multi-shot, +2 Unleash the Hounds
-1 Hunters mark, +1 Tol'Vir Warden

Mulligan: Jeweled Macaw, Crackling Razormaw, Animal Companion, Giant Wasp or Gastropod

So, v1.0 I was stuck at rank 15 and would peak at 14, but then I got these poison beast cards and they sure are valuable especially when they gain the charge ability from Tundra Rhino and I'm climbing the ranks again. Additionally, Unleash the hounds is great for drawing cards and clearing the board.

Strategy: Always play a 1 mana drop, buff with crackling razormaw, use hounds for board wipe and use poison cards with tundra rhino to remove high health cards.