While it lacked headline Legends, it introduced solid staples like Energy Exchanger and Defender
While that may make it seem like you have a chance of opening a series of different bonus cards in your individual drops, the Superheroes that each Secret Lair is themed around are making appearances in the artwork as well
If you're already in another dungeon when you would venture into the Undercity, you will instead progress to the next room in your current dungeon rather than enter the Undercity as an additional dungeon or switch altogether
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Personally I try to avoid running recursion effects that are one dimensional at this point, power creep has given us better options in a lot of cases, if you're in Black something like Lively Dirge can get back creatures, but it can also tutor one up if you don't have anything to get back
While it might sound silly to make your opponent draw a potentially useful card, the steep number of 20 would all but guarantee them milling out and being unable to do anything with whatever they draw