I've not played as many (games in said genre) as you, jjmarr. And so, if you don't mind indulging me... I've an idea for a game that perhaps you'd be able to tell me if it's something you've already seen in play.

The mechanic is fairly simple for this board game (not computer/video): A standard chessboard and chess pieces are used, with a custom deck of cards for each player. Before moving any pieces, a card is revealed that effects enhancements/restrictions/story/etc. The selling point would be banking on the creativity of the deck, of course. If there is anybody that could run with this idea (if in fact original, which I doubt) before I do, I'd love to hear about it! ♟