For original Theros block, you maintained a flavor balance between familiar and obscure references to Greek mythology
Strategically, focusing on one format initially makes sense
Maybe it betrays the very laws of magic, nature, and, science
Additionally, physical jobs will increase their PA at a faster rate through leveling up than magical jobs will increase their MA, as the only non-special job that has an above-average MA growth is the unconventional Mime which can't be used as a traditional magic unit, whereas most of the non-special physical jobs have a higher growth rate in PA
Stadium Cards: These cards affect the overall gameplay environment, impacting both players
There have been hugely popular decks, no doubt - first Pikachu EX, then quickly Mewtwo EX, Celebi EX, a smattering of other second-tier options like my Moltres-and-Charizard combo, and, well, probably still a lot of Mewtwo EX