That's right, Spark Fiend is a Magic port of the casino dice game
Anytime she attacks an opponent, you get to put either an Angle, Demon, or Dragon creature from your hand into play, tapped and attacking that same opponent
You can find a (rather cool) sample decklist, as well as a tournament report, here You could, of course, also just play and enchant Yavimaya Enchantresses and kill your opponent with some, not dark, but beautiful and terrible as the dawn ladies
A few times, I hit a Vampiric Tutor, dropped a second-turn Bitterblossom, found said Vampiric Tutor, and had the game basically wrapped up by casting my Commander on turn three
I was a prison guard at Fort Leavenworth, Miller says