As characters in Final Fantasy frequently have multiple forms, or go through immense character development - see Terra's Trance, Bizarro Sephiroth, Cecil's whole character arc - many of them will feature as double-faced cards, with different abilities on each side
Summary Epic and Iconic rarities are being introduced with Fabled
Unfinity was the last of the standalone Un-sets and introduced Acorn cards, which are joke cards with silly effects that will never ever, in any format, be legal
Short Answer: Building a Lorcana deck requires selecting 60 cards that work together effectively while following the game's ink color and card type requirements
Solitude and its banned brother Fury are free spells with mana values that trigger Up the Beanstalk
Having a whole deck stuffed full of the creature type feels pretty damn great