You can view statistics for your collection on the Statistics page. Statistics are only available to users with a Knight subscription.
The statistics that you can view include:
the total value of your collection and how it changes over time
how many cards from each set you have collected and your completion percentage
breakdowns of your collection by colour and type
a breakdown of land cards/the mana they produce (including a fun one on how much mana you'd produce if you tapped all of your basic lands!)
a breakdown of your collection based on your tags
your most valuable card
We plan to continue adding more statistics to the Statistics page. Some of our ideas include:
detailed information on why the total value of your collection has changed
detailed information on price changes for cards
some more fun statistics, such as how much damage you would deal if you attacked with every creature in your collection!
If there are statistics that you would find useful, don't hesitate to get in touch and we'll add them to our list.