The iPad app "Deck Simulator for Hearthstone" allows you to test different card and deck ideas using simulations without having owned the cards yourself. It won't do all the deckmaking for you but it can be a valuable tool to assist in deck construction and avoid wasting precious dust.
You can see more about the app here:
The app has a blog here which contains posts about it's features here:
http://decksimulatorforhearthstone.wordpress.comhttp://decksimulatorforhearthstone.wordpress.com
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