Use all default settings, compose any deck you like, watch bot how to play for several games, kick out cards play badly and fill in some other cards, the more you know how bot 'thinks', the faster to build a good botting deck.
Then you can try to edit mulligan rules or deck play rules with excel script.
Or you can try to code your own silverfish module based on current open source resource, if you know how to program in c#.