Booster Packs
From SWU Holocron
Booster Packs for Star Wars: Unlimited we designed with both Constructed and Limited (Sealed and Draft) Formats in mind from the outset.
The basic structure of packs consisted of:
Legendary cards replace the Rare card in 1:8 packs. Leader cards can be any rarity in the slot from all the available Leaders in a set (Currently Common or Rare). Bases of rarity above Common may be found in the appropriate slot.
In addition to the standard cards there were three levels of chase rarity that could replace cards in these slots. No chase cards are mechanically unique cards, they are identical to the standard cards except in appearance.
Hyperspace
Found in 2 out of 3 packs, these cards will replace Leaders, Bases, Common, and Uncommon cards in their normal rarity slot. There is a 1:15 chance this will replace an Uncommon card with a Hyperspace Rare/Legendary card. Hyperspace cards are borderless cards.
Foil Hyperspace
This will replace your Foil slot with a Hyperspace version of the Foil. There is not a currently known overall chance, but the chances of a Foil Hyperspace Rare/Legendary card is 1:50
Showcase
Showcase cards are extremely rare versions of Leader cards with alternate art and a special foil treatment. Found 1 out of every 12 boxes, or 1:288 packs.