The owner of this deck hasn't added a sideboard, they probably should...
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Mana ramp to Mirror Mirror. Use search cards to find mirror mirror, possibly tinker to play it straight to the battlefield. If you have the mana, you can untap it for 1 with voltaic key, then tap and pay the mana cost. After playing Mirror Mirror, this deck has nothing that will be able to stop your opponents deck... Which is now under your control.
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