Indeedee ex: Its Watch Over ability heals 20 damage from your Active Pokmon every turn
Like most Pokmon cards, the value of Fighting Energy depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Call of Legends)
Legendary affects rules like deckbuilding and the legend rule, while the creature types matter for typal synergies and card interactions
Its good when you need to gain life, and the fact that you can reanimate a nonland permanent opens the possibilities for cards like Lunar Convocation, Builder's Talent, and Hopeless Nightmare, among others
Embrace the massive Halloween celebration vibe with cards showcasing Pikachu donning a jack-o-lantern hat and your favorite ghost-type Pokmon
Their ability to scale makes it quite easy to set up a very fast, yet subtle clock that is capable of pressuring and/or overwhelming the table a few different ways