Sorry to you both, but the Revealer ruling given is incorrect.
Whoever is doing a reveal-and-place chooses the order, and in the case of Revealer it says "When you draw this card, each opponent must reveal the top two cards of his draw pile. Place each revealed Lost Soul in owner’s Land of Bondage. Place the rest beneath owner’s draw pile." It has been ruled that, since the opponent is the one doing the reveal, they choose the order.
This is different for cards like Gideon's Call and Fishers of Men, where "you" reveal the cards and place.
For the question on Deafening Spirit, this comes up now and then, but the ruling we have right now is that once it changes to a character, anything negating characters does not undo that change; likewise, you can't negate it as an enhancement, since it is no longer one. Instead, if you played something that negates an evil card, which it is in both forms, that could work.
Same sort of thing with Am Slave. If you have the FBTN soul out, capturing Am Slave wouldn't be undone once it turns into a soul. However, if you played something that negated all capture abilities, it would be undone since the target is valid regardless of form.
Hope that makes sense.
