Many of the energy cards just dont have a home outside of a small subset of decks
Also keep in mind that card selection spells that can put creatures into your graveyard are at a premium
Ultimately, this was a local-store Hobby Next giveaway, with availability depending on whether your store participated and still had stock left leading to the cards unbelievable rarity and sky-high price point above $1,500 (even higher on TCGPlayer)
No, you cant play just anything anymore if your goal is to be competitive
While most decks won't have tons of MTG Vehicles, getting to draw from both MTG equipment and auras is sweet indeed, making Sram a very good inclusion in most Voltron decks
For example, you can sacrifice Lembas, an artifact card with the Food subtype, to activate the last ability of Bill the Pony