There is a guide for mulligans: http://www.hearthranger....es.aspx?find=lastunread
When using silverfish you also want combo files. Make the files called:"_combo", "_mulligan", and possibly edit your "settings" file in the silverfish folder.
For setting up silverfish, you will want to look at this: http://www.hearthranger....re.aspx?find=lastunread

If you need more help and are having trouble, feel free to pm me or hit the forum button and have a look at the posts.

For pre made files and decks that have proved to run well: http://www.hearthranger....ct-----Experimental.aspx