Yes, the scope of this is pretty limited. First, there is no AutoMulligan. Second, you can only find the pobability of 1 combo. It would be amazing to see somebody expand on this and allow you to add more combo's into the same deck, but I personally have no clue how to go about doing it. Like I said, it's been useful for me because I haven't attempted it upon a complex deck yet.
On a side note, has anybody figured out a surefire why of accounting for the mulligan?