Flex Cards:
Berserker, Heavy Hitter, Fit as a Fiddle + Well Rested (If you are not worried about Temp HP)
Cards that are also good for this deck:
Face Your Fears
Copper Scavenger + Money Grubbers (For good economy)
Numb (For more Damage Resistance)
Trauma Resistance Cards
Food Scavenger (for food buffs)
Mobility cards (Run Like H)