It doesn't copy whether that creature 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, or so on
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of Urianger Augurelt's last ability)
Each one pays for .) Creature - Human Soldier Ally Zuko, Firebending Master First strike Firebending X, where X is the number of experience counters you have
The UC code is the only differentiation from Common when cards are sleeved
Riku of Two Reflections The amount of value you can squeeze from Riku of Two Reflections makes up for its dismal body