Ooooh! It's like my favorite land!
That assessment is correct. Finding 10ish Changelings, one of them being Mirror Entity at EOT so they functionally have haste is gonna be good enough to lock up pretty much any game. I also run The Scarab God, so I'll hit everyone for 10+ and scry 10+ on upkeep too.
Other non-Changeling thoughts:
My friend has a "heavy metal" that runs a ton of secret lair gods. Last time he popped this and then I killed him with Insurrection. That was quite funny.
I think commander would be improved if everyone started with this card in play. Get color screwed is a good greed balancing factor for competitive 1v1 formats but only makes EDH games worse.
I really like using this with Maze of Ith or how @DirkGently uses it with Sorrow's Path