Unlike the slow and methodical decks where Urza will likely fit best, Mishra and his melding counterpart, Phyrexian Dragon Engine, are designed to support aggressive strategies that aim to beat opponents down to a pulp
Below, you won't see Vivi Ornitier, the Chocobo MTG commander or any of the precon deck leaders

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Decks that utilize synergy with cards that benefit from the opponent's discarded cards, such as those featuring the Madness mechanic or cards like Liliana of the Veil, may find it more effective
Once you purchased the program, all the cards were free you simply "marked" the cards you had in your paper collection and used those to build decks and even play games (although it is unclear exactly how gameplay worked)
This is very much because of Time Walks existence