to OP: how do you kill your mobs? which character do you use? i might try creating a monk for mobbing purposes...
Well, you can use the monk itself while its in steel body, just put on weapons and accessories that are carded with Magic on Damage cards (Kasa, Mutant Dragonoid, Owl Cards). will need either High Orc Shield or Pirate Dagger (splurge for Pirate Dagger to keep use of an Enchanted Peach Tree Card in shield)
Other than that. Anything that has or can obtain a mob killing movel can be used. Priest, Sage, Wizard, Assassin, Rogue (Plagiarise), Gunslinger, Ninja, Hunter/Bard/Dancer(Arrow Shower at a good distance), etc.