Random. You will see it on your badges page when no more drops are left.
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Yes, you could even run it in textmode. All Source games (HL, Portal2, TF2, ...) support textmode.
But idling in the menu and Alt+Tab works, too.
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if i want to get the cards do i need to acctualy play it or i can just leave the game open for about 2 hours?
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