pokemon gx cards charizard Mewtwo/Charizard Promo Horror Colorless Retreat Cost Charizard GX #SV49 EXTENDED ART

The main thing is to focus on cards that either reward you for going wide or let you use Witherblooms discount on a huge spell

That'll win so fast in any going wide deck and note one secret...it's missing the word "nontoken" so those will gain renown and then double counters

players may only include one copy of each in a deck

You'll have to judge for yourself if they offer enough protection for your needs, you may find them a great deal

I was planning on mostly including one card per artist, but this Cleffa by HYOGONOSUKE was so good that I just had to include it too

There are plenty of options to build a flexible commander like this