It involves copying your creatures and using energy counters to let them stick around (or, in some cases, letting them die to take advantage of death triggers)
Neither Mishra nor Urza was referenced in flavor text, so who they were was just an unknown in the early days of Magic
If the Energy economy is aggressively costed, this card will be a chase rare
Further pushing the flip theme, Printlifter Ooze helps progressive build your board with each creature flipped
Most of the cards here are fierce and ready to conquer the day, but you have some possibilities for lore as well
Beyond these products, there are Play Boosters and Collector Boosters, two kinds of Bundles, and a Prerelease kit