For a larger collection, you may want to break it down even further (creatures, noncreature spells, and lands for example) if you are organizing to locate specific cards
Monitor and Adjust Humidity Keep a check on the humidity of the top of the lid because you don't want it dripping water on the cards if it starts condensing
Yes, that is extremely powerful
It can't be activated from your hand
It doesn't copy whether that token is tapped or untapped, whether it has any counters on it or Auras or Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, and so on
No matter what style or color combination of Dragons you want to play, the deck comes with a legendary Dragon that will be perfect as your commander