I definitely agree that a Lost Soul pile, if it doesn't make its way into constructed formats, is great for limited. I ended up winning the multiplayer booster draft because we played normal rules with no LS Pile and the normal draw 8.
I had Crispus, Melchizedek, and Titus Justus on the field. There was a serious soul drought and no one drew Souls for 3 turns in a 5 player game, but I was able to get a Soul every turn with this combo and because of Titus Justus 2 of my opponents couldn't even block my Crispus.