I also use the Trading Card Database on the Pokmon TCG website to look at existing cards made by other Official Pokmon Trading Card Game Illustrators to check that what I plan on drawing isnt too similar in composition or style
Some cards may also debut first as Promo Cards - for example, Lapras Ex wasn't a part of Pokemon TCGP until the titular Lapras Ex event
If you have something that seems valuable, make sure to check it for any nicks, creases, tears or fading
A gigantic Rayquaza flying through the sky, and featuring a reference to the rather obscure OmegaRuby and AlphaSapphire character Zinnia, Rayquaza VMAX highlighted the dragon theme of the expansion particularly well
It calls into question the distinction I made about moving counters versus removing them and adding new ones, since this black creature is functionally the same as Thief of Blood, for +1/+1 counters at least