Solphim, Mayhem Dominus not only doubles the temperature of our firepower, but can also protect herself from removal and serve as a great blocker
Some cards give you energy counters, usually on resolution, but some cards add energy during other phases as a static ability, attack triggers, damage triggers, and activated abilities
When games reliably end after a half dozen turns or less, there just isn't room for slower, less powerful or less optimized decks to get the time to do their thing or even build much of a board presence
Having a powerful enters-the-battlefield triggers works wonders in number shells, including Flicker and Momentary Blink effects
Storm is a Temur commander, meaning her color identity is comprised of Blue, Red, and Green