Ideally you want to be at four or five such cards (in a forty card list) but you can easily get away with less if you just play buff cards to empower your tokens or you play tutor, filter and recursion to ensure you have access to the few you do have
My youngest was an apple juice addict, and I couldn't keep up with his habit
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
Only one exists, and it was sold many years ago
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)

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