Thank you for playing my game, I'm glad to hear you still enjoyed even with these frustrations. Let me apologize for any confusion up front, I'm no stranger to the fact that my first ever game has a few kinks in it lol. Comments like these seeking clarification are very helpful as a result.
Let's first address the aura. Always rule in your own favor. If you'd actually gain a disadvantage from a benefit, that's not intended.
The mutated scenario is actually one I've heard before and something I should add to the FAQ and mutated explanation section. You should combine with the first non-event creature, so in this case this combination should have been invalid. As a result it created this wildly unfair encounter.
I hope that clears things up and once again thank you for enjoying my game in spite of some issues. Hopefully, if you play again, it'll go a bit more smoothly.