It's basically cheating (or, more precisely: a color pie break) that lets red decks get rid of problematic cards like enchantments and guarantees that its target gets out of sight and out of mind, but runs the risk of replacing it with something even worse
Terra, Herald of Hope Ive seen lots of chatter comparing Terra, Herald of Hope to Alesha, Who Smiles at Death, attempting to categorize one as strictly better than the other and thats a lost cause
It features 20 new cards, all of which are from the movie
In Magic: The Gathering, where the collector market considers cards to be investments it's frankly barbaric to play an actual game with, the equivalent is an unofficial format called Sharpie Cube, or Redacted Cube
A sets print run, while not being precisely calculable, naturally ties in with a sets rarity a couple different ways
A subtle joke, I like it