It was included in that set and the second set of that block, Dark Ascension
Spawnbinder Mage: Cohort -- Don't play this card
This can be a mixed bag, of course, but can also be quite the surprise for opponents when it comes to alpha strikes and the like
From a mechanical point of view, the Final Fantasy set also brought back a trick first employed in Kamigawa: Neon Dynasty and later refined in March of the Machine : transforming double-faced cards that are a saga on one side and a different permanent type on the other
Despite being proportionally the smallest part of the set, Meld is a nice spin on transformations that uses existing player knowledge to make things easier to understand, whilst pushing the horror angle even further than single-card transformations
Vexing Arcanix was also not really about milling, but anyone who's every played Ice Age sealed knows how often you use it to mill out people in Limited games (if they don't die to the damage first that is)