I'm not going to boldly claim this set-up can beat everything, but if you get a good initial draw, there will be nothing your opponent can do to counter you. The deck is designed to take an opponent to 0 as quickly as possible by flooding the field with low cost beasts, that are considerably buffed. Some card draw is in there to help smooth out some bad opening hands, because of the heavy mid-range set-up. The main thing is, this deck does not rely on Legendaries (Though I do have Baron Geddon GOLDEN! ) ) or any cards you cannot easily get with some simple, low cost crafting.
The way I like to think of this deck playing is a BM Hunter opening with Bloodlust/Heroism and laughing at the DPS meters!
Beast Mastery - Hearthstone Decks
(I may change one of the Snake Traps for a Raid Leader, can't decide at the moment)
V.S:
Priest - 6 turn kill http://imgur.com/sLR8WDV
Mage - 6 turn kill http://imgur.com/jhtJSYv
Hunter - turn 8 kill http://imgur.com/FT3g4rl