The Cursed Mirror enters the battlefield as a replica of the creature focused by Mystic Reflection.
First, Mystic Reflection resolves earlier than Cursed Mirror, so Mystic Reflection’s substitute impact is energetic as Cursed Mirror resolves. As soon as Cursed Mirror begins to resolve, relevant substitute results are utilized. At first, Cursed Mirror is an artifact, so its personal substitute impact applies however Mystic Reflection’s substitute impact doesn’t. So that you apply Cursed Mirror’s substitute impact, making it a replica of a creature of your selection. Then it’s getting into the battlefield as a creature, so Mystic Reflection’s substitute impact applies, making the Cursed Mirror a replica of Mystic Reflection’s goal.
The result is similar even when the everlasting getting into the battlefield began out as a creature, akin to Clone, as said in one of many rulings on Mystic Reflection:
If a creature akin to Clone is getting into the battlefield beneath your management, there will probably be two copy results to use: the creature’s personal and Mystic Reflection’s. Regardless of which order these results are utilized in, the creature will probably be a replica of the goal creature when it enters the battlefield.