A word of caution here: This guy is going to be hated. He’s not actually that powerful in EDH, because countering isn’t that fruitful, but both of his abilities are still good.
Just understand that even though this might not work out very well, blue is often a feel-bad color for others and others will see you as the big target in the game just because they dislike being countered, even though many other spells are much more effective answers in this particular format.