I got an email from Geordan from (YA)XMSB over the weekend.
I finally added the most requested feature to my builder: the ability to track the expansions you own and show you if a list can't be created given what you own.
Odds are I've broken a bunch of things in the process; bug reports/feedback/suggestions always welcome!
So first off- awesome, right? Secondly, help the brotha out and if you find some functionality has been broken, shoot him a bug report, or if you think of a feature or whatever, he's interested in those too. There's even a button for it on his website.
Thanks Geordan! Nice work as always, pal!