when building an Edison deck you have to select the date of the edison format, it would be nice to select edison so it would only show the correct errata etc.
If youre refering to selecting the edison banlist in the deck editor, then all that does is show the cards on the banlist for that format, it has nothing to do with the displayed card pool.
You can use the actual date filters to only show cards released until edison (2010-04-25)