The March of the Machine Jumpstart Boosters contain 20 Magic cards (including all the lands you need to play). In each pack you'll find 2 Rare cards (1 Rare card designed for Jumpstart boosters and 1 Rare or Mythic Rare card from the main set) and 2 land cards with a shiny traditional foil treatment.

If you want to maximise your mashups, you can combine your Jumpstart boosters with other Jumpstart boosters.