Many strong cards that have come to define the Pauper format originated in these sets, with some being so strong they ended up getting banned, such as Arcum's Astrolabe, Chatterstorm, and Galvanic Relay
As far as I can tell, the typical box will contain 0.25 foil mythics (one per case), about 1.5 foil rares, and six or seven foil uncommons, and the rest of the foils in the box will be commons (so, approximately 15 foil commons)
Similarly, if a creature rides the Ferris Wheel, leaves the battlefield, and then returns to the battlefield, it will be a new object with no memory of being phased out by the Ferris Wheel
Each character card will be able to gather a certain amount of lore