I'm going to concur with PGleo on this. I almost exclusively play high-to-cEDH and this looks like a solid mid-tier deck. Once you start going into High Level, you'll see more of a reliance on combos than what you currently have available.
The question you need to ask yourself when aiming for high level play and above is "How many turns will it take for me to get my win-con when faced with mild to moderate resistance?" High level play is roughly 5-9 turns, good cEDH decks are under 3. You've got a lot of expensive cards (mana wise) that do not appear to be easily turbo'd out sans Ghalta. You probably could push Surrak Dragonclaw into the high level range, but I would be hardpressed to find a cEDH build where he'd scrape by in that format.