Wistrit
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Not a bad idea. I would just use fan art; screenshots from the game don't have very good image quality. You could put anything you want there: for example, put a Castle on the ten, and the Ace could represent 5th-level magic from one of the four schools (there are exactly four!) from Heroes of Might and Magic V. And the Jokers would be perfect for "Armageddon's Blade" and "Frost Blade." ;)