Normal Magic Mirror | Hearthstone: One Night in Karazhan
Magic Mirror is the second boss in the Parlor wing. His hero power allows him to duplicate minions you summon and those he summons. If you play as a Mage, in addition to Deathrattle minions, you should add Flamewaker, Knife Juggler, Chrommagus and Sorcerer Apprentice are good choices to get duplicated by his hero power.
Paladin decks can easily take this boss, especially with Chrommagus and a bunch of deathrattle minions in the mix.
Location: The Parlor
Passive Hero Power: Whenever a minion is played, summon a 1/1 copy of it.
Magic Mirror Deck