I could provide some things like this. (There are already some very basic stats in the infobox at the top-right of a cardset's front page.)

I think really the details here would be easiest with the cardlist page supporting multiple sorting. Which it currently does, but only on Firefox, in bizarre fashion. So you can already sort a cardlist by "mana cost" (which sorts by CMC) then by "colour" to get all your white cards sorted by CMC, then your blue cards sorted by CMC, etc. (I guess I could provide a nicer interface to this.)

But that said, there's definitely a role for more statistics. "Average number of words" and "Average number of words on commons" are metrics that have been suggested before. I may as well provide these.

This, and other features, are possible with SQL. (This is one reason why I prefer to make cards using my own local software instead of Multiverse, although there are other reasons too. My cards can still be imported into Multiverse, though.) (But the other way around is also possible, if you prefer: You can make them in Multiverse and then export.)