As a Paradox form of Salamance, one of the most popular pseudo-Legendaries, Roaring Moon is already incredibly popular, with this Alt Art card only amplifying that hype
Gift sets and various Disney Lorcana bundles are primary sources, often featuring foil versions of legendary or enchanted characters
While there's not doubt that Green Sun's Zenith is a powerful card and would see play in Modern to add consistency to toolbox green decks with cards like Gaddock Teeg, Knight of the Reliquary, and Primeval Titan, in most situations, it isn't that much more powerful than Chord of Calling (which is instant speed and hits creatures of any color) or Collected Company (instant speed and hits two creatures, instead of just one)
So, whats the upside
If you look back at Ravnica Remastered , it really did feel like they went overboard on the serializations there, so it gets a thumbs up from me
The long-standing narrative of the Commander format has become the conflict between competitive and casual