There are basic Energy cards (like Fire, Water, Grass, Lightning, Psychic, Fighting, Darkness, Metal, Colorless, Dragon, and Fairy, although Dragon and Fairy are now typically represented by other types or Colorless in modern sets) and special Energy cards, which often provide additional effects alongside energy
Helmed by your favorite legendary creatures, Commander paves the way for big plays and epic showdowns
In other words, it is a video game based on a TCG based on a video game
Selling 5,000 commons to a dedicated bulk buyer is a completely different process than selling a curated lot of 200 holos on eBay
What if they still have that Charizard card lying around