But now that I've added some extra cards, that is one more card that will be getting removed
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Extra mana-find, and pulls more of the land out of the deck. It's not uncommon for me to get around 12-18 lands out in a game. Means I have a stronger chance of pulling something other than mana. And with how much creatures cost, if I have no mana in my hand that turn, play and get another mana out.
Also I would suggest taking Fury Charm off the sideboard so you get that trample bonus. Then they can't block your massive dragon with a tiny little flier, and have no worries. Helps control them more.
I would say add in a Furyborn Hellkite (since you have a lot of flying, you should be able to get that bloodthirst easily) and then having a 12/12 flier will hurt. Also a I would suggest actually keeping in the crucibles. Yes, they aren't FULLY needed being a dragon high-power deck, but at the same time, if you're sitting there without anything to cast, since dragons cost as much as they do, and have it in your hand, a nice filler spell. And I would also suggest cutting out the Stone Rain. Unless they are running a high cost green deck, or multideck, it's not worth it. And I've found lately, that in straight-forward decks like this, keep your options limited to what it was started at. With this deck your control comes in your creatures. They either have to block, or die.