Hearthpwn

I'm stuck with Mercenaries 280 and have only played against other Merc 280 decks. I don't understand what the numbers at the end even mean?

Endless Mercenary mirror matches - you cant even play anything new because every deck is a copy of yours and the score wont change.
Disappointing.
Dunno what Blizz was thinking with this one - the cards should have been random and not a guaranteed 4 Patches on turn 1.

Good cheap build!!
I got a 10 game win streak with this deck! Ranked up 5 times in 2-3 hours.
I made a few changes to swap out cards I didn't own (Shieldbreaker, Hatchet and surprisingly Eaglehorn Bow?) and the 2nd Revenge of the Wild (although I think I might buy a 2nd copy of this card cause it plays really well) 
I added one Spirit of The Lynx (good for fast beast boards, of course), one Hunting Mastiff (good with Spirit of the Lynx), one Dire Frenzy (good with Scavenging Hyena and anything with rush, as a backup plan) and Jeweled Macaw (its one of my favorite 1 cost cards, lol - quick to put out turn 1, and rewarding if I get a cool new beast to throw out later). 
Revenge of the Wild combos really well with a lot of this deck. I just destroyed someone by throwing all my little beasts at their biggest minion after playing Scavenging Hyena, and then I played Revenge of The Wild to get my little beasts all back alongside my now massively buffed Hyena. Opponent had nothing to stop me on their turn and conceded. 
Revenge of the Wild also combos well if you have to trade Savannah Highmane with a big enemy minion, so you get your usual 2/2 hyenas from DR and then you get your Savannah back.

Nice deck! I had fun!