Yes, to build a true master set, you must collect both the standard and reverse holo versions of all Common, Uncommon, and Rare cards
Often, a person whos three or more colors wont draw evenly from all of them for instance, someone whos blue-black-red might identify heavily with blue-blacks growth mindset and reds sense of presence and passion, but not particularly resonate with creativity or independence. But for the sake of argument, you could imagine a balanced trio as [the sum of its two-color connections] and [the absence of whatever the two remaining colors agree upon]
With this approach I was finally able to find that, in the menu code, there were some conditional checks related to the button index where the Print button would appear (6, right before the Save button which has index 7)
Mirror Entity acts as a finisher for any deck that can flood the board with creatures, regardless of how important the changeling text is
Even though it's only here due to a technicality, Mega Dragonite probably won't be excluded for very long
24 cards are also available as Secret Rare