Is this a good Yugioh deck (experts only)?

Get rid of Feral Imp and replace It with Snipe Hunter. You can use Snipe hunter to discard Night Assailant, who will be brought back to your hand with it's own effect, so you can destroy any card on the field guaranteed (accept for Obelisk). In order to deal with him you need to use a skill drain, and do it before he's been summoned, this way he has no effect, and you can kill him with whatever card floats your boat (hint hint Yomi Ship). He is also vulnerable to the technicality, "cannot be targeted", so if you use a card like Mirror Force or Lightning Vortex he's done like dinner, regardless of his effect. ;) . Hope this helps. :)