You have to be very careful not to play it until you go off because it will get killed on sight otherwise, meaning it wont help make every turn good like Prophet of Kruphix did
This is partly because Sorin is the only legendary creature that offers Extort, but the card also comes down early, setting up your life drain engine quickly

Sakashima the Impostor (for flavor with the "clone tribal" theme) Zur the Enchanter (much like in Modern, having a tutorable clone is very powerful) Rayne, Academy Chancellor and Hakim, Loreweaver (where Mirrorweave can be a copy of the best aura enchanting your commander) Estrid, the Masked (enchantress) Angus Mackenzie (where two Ghostly Prisons or Propagandas are better than one) Zedruu the Greathearted (where Mirrormade can copy something Donateable to give to your opponent for card advantage) Teferi, Temporal Archmage (where Mirrormade can replace Copy Artifact as part of the Isochron Scepter + Dramatic Reversal combo, where the main plan is to get Dramatic Reversal under Isochron Scepter to get infinite untaps of non-land permanents and then use Mirrormade to copy Isochron Scepter and imprint something that actually ends the game, with Swan Song being a popular meme-ish choice)
My youngest was an apple juice addict, and I couldn't keep up with his habit
I can see this being a few dollars down the road just because of how silly it is, and foils will probably command a bit of a premium, but thats about it