Dawn, Warriors Legacy Mizzix's Mastery is a cool build-around that can go nuts in the right deck
The first category to look at is the most obvious one: spend X mana to cast a card, and when it enters the battlefield, you get Y energy
It provides pressure and board control, but Im most impressed by the entirely unregulated sacrifice ability: The best sacrifice outlets are those that you can activate whenever you like, as often as you like, which Grimgrin kindly offers
We have a separate guide to all the MTG phases if you want to go into a specific phase in more depth
The commander of the deck, Galea, Kindler of Hope, is all about getting Aura and Equipment out as quickly and efficiently as possible, letting you look at the top card of your library and then if it's and Aura or Equipment play it directly from the top of your library and attach it to a card