Welcome to the Official Redemption® Message Board!
Prosperity, Dull, Lawless, Humble, Exchanger, Imitate, Forsaken, Darkness, Exiles, Wanderer, Punisher, Awake, Covet (Vindicated is another LS I haven't used much myself, but have seen other people use effectively.)
A 50 card deck with three souls has the same draw potential as a 54 card deck with seven.
And if you are going to propose that this 5-LS-in-1 card start on the top of your deck by game rule... Well, at that point you might as well just propose that all LS be in a separate deck.