It has a lot of generically good tools for Commander at large, and it just so happens to have the best reprint value, despite not being that generous with its reprints anyway
On top of that, color can be used in more creative ways when artists dont have to worry about capturing something in a more photorealistic light
Competitive players have built decks around Charizard in virtually every format it has been legal, from the original Base Set days through the EX era, the Mega era, the GX era, the VMAX era, and now the modern ex era
TM044 Dragon Tail 60 90 10 -- The target is knocked away, and a different Pokmon is dragged out
Reib VMAX special illustration flash card 1 sheet
Just because a card will reach a certain point in the future, doesnt mean it should start out already at that point