And while she's great (and reasonably popular) as a commander because she's cheap and her attack trigger is one of the best in the format, those same characteristics make her valuable as a card in the 99 as well
Dragons were obviously going to find themselves in a D&D MTG set in other ways, and there are a few cool examples of this
Cultural Impact: A symbol of Pokmons global phenomenon, appealing to fans across the world
The more opponents you have the more reliable it is, making it an EDH staple
Each era is gonna have its card that was popular for play, but if that card fades into obscurity 1 year after rotation, how iconic could we really say it is
Szarekhs flying ability also makes him a hard-to-block commander, meaning you can rack up commander damage if needed