Urza's Destiny is a small set with 55 commons, 44 uncommons, and 44 rares. This is the normal size for a small set of this era. Foil cards are included in booster packs with advertised odds of 1 : 100 cards. The set was printed in the USA and Belgium. 
Urza's Destiny was sold in 15 card booster packs. Booster boxes have 36 packs.
The Belgian printing uses striped collation with 10 × 11 sheets and 12 × 11 sheets. Packs are back-facing and contain 3 uncommons, 1 rare, and 11 commons (in that order). Foil cards are inserted only between stripes (in other words, after a card on the left side of the sheet before moving all the way back to the right), displacing a card of the same rarity. It is possible to get multiple foil cards in the same pack.
|3 Uncommons||1 Rare||11 Commons|
The common sheet contains 55 cards each twice. The choice of top row prevents blue cards from showing up next to each other on the sheet.
 The "Compilation of Manufacture Information for MTG Products" thread on the Magic Librarities Forum confirms the existence of US-printed Urza's Destiny, but I couldn't identify any US openings during my research.