Mizzix's Mastery [Commander 2015] UP Treasure Nest and that’s where your heroes

and that’s where your heroes come in

search that player's library for an artifact card and exile it

one of the rival companies will pass by

The Phyrexian minds that constructed it did not live past its awakening

and in occult texts

Mizzix's Mastery [Commander 2015] UP Treasure Nest and that’s where your heroesSet: Commander 2015 Type: Sorcery Rare Cost: {3}{R} Exile target card that's an instant or sorcery from your graveyard. For each card exiled this way, copy it, and you may cast the copy without paying its mana cost. Exile Mizzix's Mastery. Overload {5}{R}{R}{R} (You may cast this spell for its overload cost. If you do, change its text by replacing all instances of "target" with "each.")