Okay, so low Level Monster plus a +10 Monster Enhancer plus a +/-10 Enhancer Enhancer and
Mate.
Mate creates a separate Monster which actively duplicates the original.
Illusion, the last card you referred to, can be played on either the original or the
Mate (since they are both separate Monsters, regardless of the link). If you replace the original Monster, the
Mate duplicates the new Monster.
So:
- The Mate card does not get returned.
- The Treasures would be based on the final Monster, so had the Wizard charmed the Mate, then Illusion had been played, the final Treasure count would be based on what the new Monster was.