So Guys, just beat this boss after many times testing the other decks.
I was tired of this mechanics not working so decided to win the game! How? Hitting face of course!
I actually used a budget version of this deck, had no patches, no jeeves, just put any spawners or charged minions instead. (any 1-2 mana cards)
You won't need any of the high cost cards since the ideia is to beat him in 3 turns or 4 with your roars hitting many minions. This boss has no spells, and since Baron Geddon is the only legendary AoE, you'll be ok if the game is finished before it hit the board
I had lucky starting hand, but with this kind of decks happens more often than we wished on ranked, but against the m achine, is actually pretty good
Hope it helps somebody else, so long ago since this expansion has fled from us