I've been considering this since I originally started making Revelation cards... And now I think I have the card somewhat figured out.
Note: Involving Final Judgement is exclusively the Judgements on the World (So Enhancement wise it's just the Seals, Trumpets, Bowls and the Golden Censor)
Here's the main points:
1. First, this does make the win condition more challenging to meet as you have to win 7 Battle Challenges in a way that you get to use an Enhancements.
2. It can only be used in a "Revelation Angel" deck (which I'm currently making Heroes for)
3. It would make the dynamic of the game more interesting as there is now a new aspect to the game and makes remove from the game cards more powerful against this deck.
4. It makes Battle Challenges matter more.
5. It means that Soul Drought isn't something to worry about too much.
6. It gives angels a unique way to play on their own for players that wish to play Silver-only decks.
I am very much open to thoughts on this and would like to get some opinions on the concept.