Rat Packs is what needed vs keleseth aggro decks. Good old Dark Iron Dwarfs as well as Houndmasters synergies great with it.
Sometimes it is worth to play hyena on open board, if you have follow-up with Crackling Razormaw into Unleash the Hounds (thats game basicaly)
DK is super good vs shaman and paladin, pretty gud vs druid, mediocre vs priest.
Swamp King Dred - great card, counterplays The Lich King on curve, gameover with windfury adaptation from Crackling Razormaw. Not a bad legendary, crafted it with no regrets.
Possible deck substitutions:
-2 Jeweled Macaw
+2 Fire Fly
(if it gives shitty beast its irrelevant, and firefly better for early game with Dire Wolf Alpha)
-1 Swamp King Dred, -1 Savannah Highmane
(i personaly prefer my variant without bonemares, but the card is busted, so it might be better in some scenarios)