for starters do first level about everything there is desent cash and when you are ready go second floor for orc skeletons(orc skele card draws nice prize on market) and zenorcs but in second floor you need to look out for orc archers on lower leveled characters.
or you just can go to outside of orc dun and kill orc ladys for cyfars and if you lucky you might get wedding veils or wedding dresses those are nice cash and if you get really lucky orc lady card... just beware of Orc Lord.
of course toy factory works too...
Main Chars.
Lady_Millia - Lady Knight 9x/6x
Moonsorrow - Assassin Cross 99/6x
Takahashi - champ 9x/6x
Whitebane - Pally 9x/6x
Nakazawa Sensei - Prof. 9x/6x