Youre encouraged to use the cards in casual formats, though you can always bring this up as a Rule 0 discussion with your playgroup about potentially including cards that aren't technically legal
To do that, we developed a workflow that asked concept artists and card artists to pull hallmark character designs from Yoshitaka Amanos original (and legendary) concept art, the original FFVI sprites, and the FFVI Pixel Remaster character portraits, to synthesize the most consistent elements of each characters design into something new. We also encouraged our artists to punch up finer details and explore elements where they thought they could push (fabric, patterns, textures, etc.) Then, we would meet with the Final Fantasy VI review team, and they would give us feedback on what core elements they wanted to preserve and what new elements they were excited about
44% of all Neutronium packs are estimated to be worth somewhere between $3,000 and $4,000, according to GameStop
What do you think of running generic tribal cards that can be picked up for any tribe