I have used energy mechanics in cube before but in an Aetherworks Marvel build
Its actually pretty cool that your normal go-to cards for that, such as Teleportation Circle and Conjurers Closet, dont really work, since you want your blink effect to happen before or during combat
Remarkably, there is a confirmed sale of this card for over $500, and that's where its market value started out, but it has since crashed all the way to $104, and based on more recent sales for under $100, it could fall further still
If your creature is likely to get removed, you can hedge your bets with cards like Junk Diver, Sanctum Gargoyle, Solemn Simulacrum, and Sphinx Summoner
Artist Series: Kieran Yanner is still a fantastic deal even without a good bonus, which is far better than most Secret Lair drops we see
While I think that seven mana is expensive to get something that does nothing on its own, you can always cast Fractured Realm first and then cast Mirror Room in order to make two Reflections for the price of one