The real power comes from Obsidian, which deals a lower 130 points of damage to your opponents Active Pokemon, and then an additional 130 damage to two of your opponents Benched Pokemon
Of course, with Charizard being such a perennially popular Pokmon, it makes sense that it features on the most highly valued shadowless card
For instance, when the new Simba card boosts, the player reveals the top card of the deck
Does the simulator use real Pokmon TCG pull rates
Once that happens, the value of X won't change later in the turn even if the number of cards in your hand changes
While each card has an icon in the top left corner to define if it's the front or the back (such as Innistrad-based sets using a Sun and a Moon, or Ixalan having a compass and a mountain), the front face is always the one with the mana cost