Adding more value to him is the fact that late in the game you can transform him and either dig for more resources, blow up any creature/planeswalker or recur something from any graveyard
And if you're sitting at your local game store and you hear someone singing I've got a golden chiiiicken in Charlie Bucket's voice from the other side of the store, rest assured they hit the jackpot with one of these
The Spirit has Flying and can unlock a Room upon entering the battlefield, which is a big deal depending on Room synergies within a deck
This can be done by activating Selenia's ability numerous times while the activations are still on the stack, allowing her controller to pay absurd amounts of life, then using the aforementioned spells to topple the life totals of one's opponents
However, like the rest of the Kamigawa: Neon Dynasty legendary spirit dragons, Atushi gives its controller a choice between two effects upon its demise