The Water type deals extra damage to the popular Fire and Fighting types but can be weak to Lightning, Grass, Fighting, or Metal
It can set up many different combo situations, and also give you a pretty good reason to gain life

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 bsexplore 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. "It's our hope that the [FF6] character designs should feel like how you 'remember' them..." So they had the four games decided, but when it comes to Commander, thats only half the equation WOTC also needed to figure out which characters would lead each deck

Slimefoot, Thallid Transplant does bring in a spellbook of many great fungi and saproling-related cards but does not meet criteria on its own
For brevity sake, Ive cut them down to six