Azusa, Lost but Seeking: 1/2 creature, "You may play two additional lands during your turns." Exploration, 1-mana enchantment: "You may play one additional land each turn." Probably not needed with Fastbond, but might be less expensive alternatives. And you probably need more than 4 cards that accellerate your land playing.
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Add Power Surge: Normally not useful when you can tap your lands without worry about mana burn, but with Mana Barbs they can either tap their land for damage ... or not tap their land for damage :)
Yeah, I've played against it, so I know it's pretty effective, but looking at the card list it feels like it's all over the place, and trying to do too much. The fewer things you focus on, the more consistency you'll get out of your deck. It seems like you like the concept of unblockable creatures with good "on player hit" abilities; you might consider splashing blue for Invisible Stalker (1/1, unblockable hexproof - doesn't get much better than that for "auto player hit"). I know there are other creatures with built-in Lures as well. A dead-iron sledge will kill everything you just Lured. I would add two more whispersilk cloaks, and some other equipment than the quietus spike, like some of the two-bladed swords. You might even consider an Infect creature (though that would go against focusing the deck). There's also Typhoid Rats, 1/1 deathtouch for 1 mana. Anyways, those are just some suggestions.
Too many enchantments can lock down this type of deck. Also, it needs as many artifact lands as possible - at 17 land for a 60 card deck it's already running light. So, it's not like I would be able to just "remove" green anyway - there will be SOME other color of land in there. Besides, ANY deck needs removal of some sort - if I didn't have the Naturalize I would just run Terror or something similar instead.
Yeah, the "actual" sideboard has plenty eldrazi to bring into play, I just didn't put it up here. I'm still trying to figure out how to fit the overruns in, but I don't own them yet either ^_^