I like this deck i might make something like it soon. Only thing i can think of to make it better might be some nonbasic lands that can produce different colors or some teramorphic expanses. Drawing sample hands made me think that this deck is pretty vulnerable in the first few turns while trying to draw enough/the right color mana.
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Try instead of the goblin shortcutter some mudbrawler cohorts. Same cost they are almost always 2/2 and they have haste.
Wow I really love this deck. The only thing I can think of is cascade killing all your lands so that you might not have enough left over for Progenitus. But otherwise awesome.
Everything looks nice for a burn deck. Not so sure about the 4 Terramorphic Expanses though considering this deck only uses mountains.