Its basically a free Negate in blue decks, and its a key card to win counter wars, stop your opponents turn-0 combos in many formats, or just protect a key threat you might have
There are also a few ways to sacrifice enchantments, including to the Bargain mechanic, so getting rid of this negative Aura is easier than it might seem at first
How Do I Evolve Pokemon During Play
This card is what allows Arceus V-Star to attack as early as turn two and start powering up the rest of your attackers in your deck, which is literally insane
In Zirilan of the Claw decks, you have an additional way to avoid exiling the creatures you cheat into play
I think that with the knowledge and expertise that R&D has they could make a killer set with all the interesting flavor that Fallen Empires had.