That three-foot distance is horizontal, not vertical
Perhaps more important is Atraxa's enters-the-battlefield ability
Thats great, as this is a fun Golgari Elf option to choose as your commander as well as in any Golgari Elf deck
However, if instead the creature's power is raised above 2 after the ability resolves, it still can't be blocked that turn
That said, if you want to go for a knight deck thats very attack-heavy with a focus on playing multicolored knights, this card can give your attacks a huge boost, especially by making your white knights untap so you can protect yourself after attacking
Arclight Phoenixs hook, needing you to play three sorceries and/or instants, is comically easy, especially when viewed through the lens of a Crackling Drake deck