Unless you're dead set on having that changeling, I would consider maybe putting some dragon hatchings in there. And maybe some dragon storms. They are fairly expensive, but with your mana ramp and that storm ability they would be pretty nasty. Just my two cents, but I definitely like this deck. My friends always hate when I play slow dragons, I can't wait to nail then with something like this!
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Nice, I think the only thing I would change is to add a couple of life gain options, at least in the sideboard so that the option's there. But I like this! And one thing I had forgotten about with Urborg, Tomb of Yawgmoth is swampwalk, because it affects their lands as well. Overall though, nice. I might have to borrow this set-up for a little while ;-)
Alright, I'll check it out.
Why thank you very much!