No use playing the geopede w/o 4x arid mesa and 4x scalding tarn IMO
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Goblin assault will ruin a goblin deck. It forces all your guys to attack every turn. You might need blockers and your opponent's creatures can probably mess up a lot of the goblins that you've been forced into swinging with.
Don't forget Kabira Crossroads. With that in your combo you can gain infinite life and have a backup if you don't find the gladeheart.
I like the bloodghasts in there because they make triggering the ascension easier, they also don't mind non exiling removal. Obsidian fireheart is a cool creature, but he's too mana intensive and would likely just die to removal quickly. I'm going for creatures that evade removal and have repeatable value. The fleshbag's are in there to get rid of their hard to kill creatures by abusing my hellsparks and bloodghasts as a sac. I'd go for gatekeeper of malakir, but I think he's a bit too hard to play with the BBB cost, plus I'd rather have a 3/1 than a 2/2 in an aggro deck.