I'm a big fan of
Surgical Extraction effects against Canadian. Extracting any one of their threats turns the MU into a one-sided battle. Not to mention, if you manage to extract their
Tropical Islands, well... they don't like that one bit. Surgical is a must answer card for them, so they need to counter it or they lose and countering it puts them heavily on the back foot against us as it means that their disruption is being used to defend them rather than disrupt us - the fact that it is essentially free to cast for us means that it plays around
Daze and, well it's just fun to see their face when you cast it.