The player character is the first person to ever give him a challenge which leads to him becoming utterly obsessed with fighting them to the death, to the extent that he fuses himself with a dragon spirit and orchestrates a world-ending catastrophe just to bait you into fighting him. Mechanically, Zenos yae Galvus is a double-faced card that can trasnform into Shinryu, Transcendent Rival
It's important to remember that the skeleton is a flexible, living, breathing document
Note that these permanents have subtypes, so every subtype of creatures, artifacts, enchantments, etc
"Mana hosed" is one slang term for when you don't draw as many lands as you want, and "mana flood" means that you've drawn far too many
Did they do justice to the original Final Fantasy source material