Deal Man was built as a card dealer in Dr. Wily's casino.  However, when Wily decided to take over the world yet again, he reprogrammed Deal Man (along with seven others) to aid in his evil scheme.

Deal Man is based around the power of luck, able to manipulate it to be in his favor (aka fixing the odds), due to the gold poker chip on his forehead.  His weapon, the Luck Dealer, fires out a random card that can damage, stun, or when he's unlucky, heal the enemy.