Each Battleground army comes in two different decks. Army Starters contain eighteen unit cards, a thirty-card Command Deck and two quickstart reference cards, plus the basic rules. This gives you all the cards you need to get started - in play terms, each unit card is the equivalent of a boxed set of miniatures. Army Reinforcement decks each contain fifty unit cards - enough for almost any army you can imagine - and the advanced rules. Reinforcement decks also include two unit types not available in that army's Starter.
All you need in addition is a flat surface, an opponent, some dice and a couple of dry-erase markers.