If cheat engine is any indicator, it's not going to work. Personally I'd just be happy if their update meant a proper name change. Their own fault for making people use the same username as their AE account.
Edit:
In case you were wondering the results with cheat engine were as follows:
Character's Energies: Yes, and can be altered.
Problem: Any cards that are powered beyond your server energy would just register as deleted.
Character's Charge rate: Same as above.
Enemy energies: Nope
Enemy charge rate: Nope, but kinda pointless.
Player Health: Yes
Problem: Doesn't really work, and can cause a disconnect as the system tries to figure out why they aren't dead yet.
Enemy Health: Yes
Problem: Same as above.
Reason a bot for oversoul seems hard:
1. The cards are random and thus a bit on the unpredictable side.
2. The system is still slightly unstable prone to freezing up on enemy turns whether they are messed with or not.