Toph, Earthbending Master and Wan Shi Tong, All Knowing both seem like particularly fun commanders to build around
Since all of our creatures except for Hinterland Sanctifier are legendary, if we can get some counters on Aerith and then have it die (which we can do by playing a second copy thanks to the legend rule), our team will get massive, maybe big enough to win with just one attack
II, III Put a +1/+1 counter on each of up to two target creatures you control
Coveted Jewel There are more busted cards I can copy with Mishra, Eminent One, but if I do that once with Coveted Jewel, I draw six cards for neutral mana in a deck that usually has a Slobad, Iron Goblin effect lurking around
Youre unlikely to run out cards playing Black
Marcy: More for the cool art, but FF games are (traditionally) turn based RPGs, and this recreates a battle from FFVI, the game that really put FF on a lot of people's radars