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elf ramp into hydras
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Good start. ;) Honestly, it doesn't seem like you need much more ramp. Surprised you took Burgeoning out of this particular decklist. Honestly, though, I'm not sure how much the Feral Hydras are helping you. I think you might want to take another look at Adaptive Automaton, as like Spidersilk Armor, he can make the Protean Hydras indestructible, as well as helping to get Primordial closer to the inevitable.
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Also, I say wait for some Dark AScension cards. There may be some in there that help. One in particular might be Increasing Savagery.
The way it is now looks pretty good. You've got a good amount of cards to deal with disruption (though I'm not sure what Privileged Position gives you over Asceticism? They both do the same thing, but Asceticism allows for regeneration.) Everything else looks stable. From here, it's really up to you to refine the list and see what works, what doesn't, why it doesn't, and what would work better. :)