Does this work in a non-commander game?

Step one: Play Angus MacKenzie as your commander.
Step two: Living Wish for Norin the Wary.
Step three: Discard Norin the Wary.
Step Four: Ascend into Immortality Norin the Wary.
Step Five: Control Magic your opponent's Fiery Hellhound.
Step Six: Activate City of Brass for one red mana, pumping Fiery Hellhound. High fives all around.

Hmmm. Well, in non-commander this is pretty much just a two-step resurrection. Although it's equivalent to "Return target creature from graveyard to hand" for which seems a bit cheaper than normal for white. Especially as, presumably, this lets you re-res the creature like a normal commander, forever.

Adding general damage to a normal game is fiddly; but as life totals are 20, it isn't going to matter often enough to care about. So that's probably ok.

So yeah - go for it. I think this is a bit too cheap for such a flashy effect, and would probably want, you know, reminder text for wtf a commander is for non-EDH players, but sure.

It's not intended to work in a non-commander game. For some reason I thought it just automatically wouldn't work.

jmg: If that step 6 worked, then you'd have a bit of a problem getting the blue mana for Control Magic in step 5.

However fortunately this is an issue that's already been addressed with Sakashima the Impostor and Lazav, Dimir Mastermind. The commander's colour identity is a deckbuilding-time restriction, and doesn't change even if the card currently identified as your commander has a different colour identity to what it did at deckbuilding time. So sadly the red mana isn't available.

I guess it automatically doesn't work in a non-commander game since the word "Commander" doesn't have any rules meaning there right?

I have no idea. I guess I'd need to ask Matt Tabak.

Hey! This has seen something close to print as of You're In Command.