It doesn't copy whether that permanent is tapped or untapped, whether it has any counters on it or Auras attached to it, or any non-copy effects that have changed its power, toughness, types, color, and so on
While money isn't everything and there are plenty of reasons to open a box even if the value is bad (for fun, for drafting, etc.), if you're going to spend $200 on a box of cardboard, ideally, you'd like to know that the cardboard you open will be worth the investment
If instead the format is all tokens, Siege Rhino, and Monastery Mentor, Soulflayer looks much worse
Rapunzel, Letting Down Her Hair and Scar, Fiery Usurper, and Aladdin, Heroic Outlaw are the deck's only real brawlers, so its important to maintain your presence on the board and try to control it as early as possible.
Urtet is the best myr commander, as its the only one that actually interacts with a deck full of myr creatures