That requirement is indeed a drawback, plus there's nothing here to add to your mana, but otherwise, this Uncharted Secret Lair treasure hunter is a good way to use an opponent's strategy against them
Battles are susceptible to more than just combat damage, though
Given this precon directly combats against so many black effects in other decks, if you choreograph your move at sorcery speed, you leave yourself extra vulnerable to a mill or recursion deck flinging your glorious chosen card straight into your graveyard
Terisian Mindbreaker You want this for a mill deck, sure
Sacrifice after III.) I Urza's Saga gains ": Add ." II Urza's Saga gains ", : Create a 0/0 colorless Construct artifact creature token with 'This creature gets +1/+1 for each artifact you control.'" III Search your library for an artifact card with mana cost or , put it onto the battlefield, then shuffle