Anyway, I was also thinking that another cools spell that could easily be added is the Warcraft 2 spell called Holy Vision which is from a Human Paladin. It revealed a section of the map for about 7 seconds I think. I forget how long it actually lasted. Anyway, this seemed like a great spell that paladins could use for their class.
Effect: Your opponent plays with their hand revealed for X turns (maybe 2 or 3 rounds or whatever, 7 seconds would convert to 7 rounds which is probably to long).
The "WoW" version of "Holy Vision" was terrible. It was a damage spell rather than an informational spell. The war2 version is far cooler: