Absolutely no worries!
Not only was I able to reproduce and fix the bug, but thanks to the testing scenario I caught 2 other obscure bugs! You are a lifesaver, Auradev!
I've also fixed the behavior of stolen cards to align with the expected behavior (If you kill a stolen card, it goes to its original owner's graveyard and so on), and also placed a fair amount of safeguards to prevent other locks.
I'll do some further bug hunting and some rebalancing based on your comments, and then I'll upload a new version later today.
Cheers!