Entity mirror not proccing

Hello,
During my last game my astromancer solarian prime put a mirror entity in a play. My adversary ( a priest ) played Astromancer solarian prime ( stolen from thoughtsteal ) too during his turn and my mirror entity didnt proc. It did proc in the turn after that.
I have screenshot if needed

https://us.forums.blizzard.com/en/hearthstone/t/how-to-share-links-to-screenshots-videos-and-replays/2242/6

Also was the board full?

no my board was empty of course

It’s possible that the prime minion died during its battlecry (like to an AoE spell it cast). Since Mirror Entity triggers after battlecries, it won’t copy a dead minion.

> https://imgur.com/a/mwLYUQ8

No she was still alive and it wasnt cast by the beginning of turn of reno and i have 8 mana because i got mana burned by the priest solarian

it would be good if you could include what spells was used by the prime aswell