Second, "non-white" is a bit clunky
As for the X spells themselves, that includes a rich variety of Hydras such as Hydroid Krasis, which is overwhelmingly strong even without Zaxara there to generate additional value on the side, along with other staple Hydras like Lifeblood Hydra, Protean Hydra, and the mighty Genesis Hydra
Because it is an ACE SPEC card, Legacy Energys inclusion has to be weighed against other potential ACE SPEC options as only 1 of any ACE SPEC can be included in a deck.
As for the Mega Man Zero 3 cards, they change the Resistance Base and add an overhaul of new things to it as well as Weapon Upgrades and Bullet Appearances to make an actual Buster Shot look like a real bullet that an actual gun fires
The only "disadvantage" is self-gating one of your own dorks on color back to your hand
Its all cyclical in nature and adds up to a commander worthy of cEDH tables