Well, seeing as how cancellation… kind of sucks atm, I could go with it targeting any one specific spell, and taking it out. But cancellation should cost its normal 20 or 25 mana, and also cost what the spell affecting them costs. This includes time, mana, and moonstone spells. People that use a moonstone to cast one of the most over costly spells in the game, slow, would make it almost pointless to use slow ever if someone can just use cancellation real fast to counter it. But making cancellation affect any spell would be worth it, even people behind spell deflection. It isn't like it would be hard to quaff a potion of spell deflection down if it is lost in battle. Just a thought.
Balder