Warhammer 40,000: Open War Cards Indomitus
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These allow you to quickly and easily generate a mission by randomly choosing a deployment, objective and twist for your battle. There are also ways of evening up games where there is a difference in Power Levels between players so they work great for spontaneous pickup games. With thousands of different combinations, these cards will keep you busy for a good long while without ever repeating a game (unless you want to).