(as this saga enters and after your draw step, add a lore counter. sacrifice after iii.)
i — urza's saga gains "t: add c."
ii — urza's saga gains "2, t: 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 0 or 1, put it onto the battlefield, then shuffle.