One non-dragon commander that may like the Hellkite is Child of Alara, a WUBRG deck that may wipe the entire board to start things over, then reanimate threats like Two-Headed Hellkite to resume the offensive thanks to haste
This version of the card was awarded at the second Pokmon TCG tournament held in 1998, but the card's description actually claims that it came from the first ever tournament, which isn't true
Goh's Galarian starters (Cinderace, Inteleon, and Grookey) each represent the character's own personality
That set also comes with EB01-017-blueno which is just a common blocker that has the Film type, so he's also searchable (and playable) by a lot of cards in the deck
The combo of first-gen nostalgia and excellent artwork are the factors most likely driving this
That worked, and they didn't ask me to make any other promises so I didn't end up losing any creatures