And they are characterized by a unique holofoil pattern
Nimble Larcenist is the first Obscura card to look at, and while it might seem unassuming, I think its a key piece for blink decks
Might and Magic tends to have a more narrow board with bigger threats, and Resist makes it easy to trade up to try to maintain board advantage
From a law perspective, yes, custom Magic cards are legal for personal use only
Instead of renaming them or giving them a special type, the Shiny Pokemon in Hidden Fates were simply reprints of recent Pokemon cards, only with each Pokemons shiny coloring and a special silver foil background
These will be your Character, Event, and Stage cards to be used over the course of the game