You use these again, to reduce the effective size of your list thus upping the important card ratios
Kind of a weird boardwipe/graveyard hate, but it's flexibility means it can be used both defensively to stop combos and to your own advantage synergistically with other cards
Beginner-friendly products like Pokmon Trading Card Game Battle Academy or Pokmon TCG: My First Battle help teach the basics and include balanced decks to learn with, though newcomers will need a second player to practice with
It's a riff on Birthing Boughs, which has a similar activated ability with the numbers tweaked just a bit differently
Basic energy is not limited to deck building
In the first place, '8' is the story of these two, and if I'm going to build a commander deck, I at least want to put these two in the same deck