Scourge of the Throne will not generally actually get to do anything, as you can't be certain an opponent will be the highest life. Perhaps consider removing that for something with a bit more synergy.
Maskwood Nexus will make all your creatures trigger your Dragon ETBs, not to mention letting you be sure to get a trigger every turn. Additionally
Dragonspeaker Shaman and
Dragonlord's Servant will get you a discount on all those creatures regardless of what they normally are.
Aggravated Assault. As long as you can generate 5 mana per attack, say hello to infinite combat steps.
Wulfgar of Icewind Dale will double your attack triggers, which you've got more than a few nice ones.
Edit: Since I first posted this, I see you've added all three suggested cards at the expense of some lands and ramp options instead of that dragon. You're not going to want to drop your landbase much, Klauth is expensive to cast after all. Is there a particular reason for your choices?
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