Discovered entirely on accident.
On turn 1, both players have two options:
A) Play the spy card like NOOB, throwing all dignity and reputation out the window in exchange for permanent intel on enemy whereabouts.
B) Don't play the spy card, and do things you're way like PRO.
If you're at the top of your game, then it's a fun way to challenge your wits from time to time.
If you naturally suck at 1v1s, then... there you go! Not only will you be given an appropriate advantage, you also might receive the opportunity of learning something new from your opponent in-game, rather than having to sit there for minutes on end after a game's ending, staring at the history trying to figure out piece by piece of what you did wrong.
Any comments? Thoughts? I have the idea of turning this into a league soon.