Random Playing Cards

Last week, a math teacher I was working with was using playing cards to teach adding and subtracting integers. The red cards represented positive numbers and the black cards represented negative numbers. The math teacher asked me if I knew of a website that would randomly pick playing cards so he could use his interactive whiteboard for the lesson instead of a deck of cards. Initially, I suggested the teacher open up a solitaire game and use the cards he saw for his math problems. Then I discovered the website Random.org. This site was perfect for his lesson because you could pick the number of decks you want included as well as the specific cards you would like in your deck.