In addition to the "Filter by:" dropdown, I would like another dropdown to filter by group.   So when I'm looking at a group (e.g. "Holiday-Kins"), I can select a group (e.g. "Checkers") in that new dropdown and then only dragons that are in both groups will be shown.     (In a perfect world, there would be more than one of these dropdowns so we could filter for dragons that are in 3 or 4 groups... but combining two groups would already be great. )