Okay, so in the "Fun Finds" thread,
this spell came up, to give you back whatever spell levels you wanted in exchange for a dragon egg. From there I just had to find out how to get a lot of dragon eggs.
Here we find that Red Dragons can lay 2-5 up to once a year, and they can lay them after 165 days. So let's just Rebuke some Red Dragons with the Fire domain and keep a Dragon Farm. My next problem is going to be how to keep them incubated for a while so they don't die. I'm sure something can be done with a Portable Hole or something.
If Rebuking Fire creatures works JUST like Rebuking undead, we should be able to snag some items that make us better at it (Rod of Undead Mastery I think is one), and get the Deathbound domain so we can control more dragons. The base also protects itself since it's populated by Red Dragons under your control.
Other thoughts?