Since youll pay life rather than mana to cast opponents spells, youll need lifegain effects, something that black cards have plenty of: Gray Merchant of Asphodel or Sheoldred, the Apocalypse balance out the life costs for casting opponents cards you exile after combat damage
That Food conversion effect is most relevant for Ragosts second ability, mind you
Even as power creep shifts the meta of different formats, Angels remain some of the most powerful tools competitive Magic has to offer.
But if its Final Fantasy flavor theyre going for, theres plenty to consider from other Final Fantasy cards, whether were talking about the core set, Through the Ages, or some of the Commander decks
Similarly, while it's unlikely we'll "unbuff" cards that received balance adjustments to improve playability (and currently have no plans to do so), only a certain type of dark-empowered entity deals in absolutes, and we're not them