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It is a collectible card game. The $20 purchase gets you a set of 266 cards. That's many, but not all of the cards. Booster packs are also available at the website. However, matches are based on deck weight--two decks of equal weight are viable against each other, regardless of who has "better" cards.
Black shadows usually means your video card driver is out of date, or your system is not supported. Check out the system requirements here: Minionmaster.com
Well crud. Can you email firstname.lastname@example.org with your dxDiag report and we'll look into it? En.support-berlin.gameforge.com
@Carnival73--There is a single player, offline component which you can play against an AI. You can pre-order to get a full card load-out and not have to worry about buying packs.