Quote Originally Posted by theMonster View Post
Rarely does it exile the copies, but I've found it to be worlds better against Elves because they generally have mana to pay for Flusterstorm when they're ready to combo off. Also, against Storm, sometimes good pilots blind-name Flusterstorm with Cabal Therapy, so having Invasive Surgery diversifies my hate. But maybe these are too corner-case to merit playing I.S. over Flusterstorm.
I use my flusterstorms a lot to win counterwars over MF or FC versus control decks. If you don't need to fight instants I guess IS can be better.