The idea hit me while rolling and creating my Complete Scoundrel sorcerer. She has a pseudodragon companion named Kisen.

The system emulates a blackjack style card game, but only two cards are in play. You can throw out one card. Card values are based on d10 rolls. For instance: Player One rolls 2d10 and comes up with a five and a six. His total would be 11. Player Two rolls a 4 and an 8, yielding 12. Both players can now choose to reroll one of the d10s, and take whatever roll that is. Better or worse.

The watch part of the name has a roleplay meaning, and a method by which fairness would be determined. In this case, Kisen would be watching whoever plays against my character's cards, covertly. But normal playing would involve 4 players. 2 who play, and 2 who watch to make sure everything is fair.

Ideas?