I used to be firmly in the Energy Flux camp on this one. (I still think Flux is just crushing, and at least in Control Oath, which runs a bit mana dense, it's pretty good. They can make all the thopter tokens they like.) However, watching Rich Shay, and also my wife as they run Xerox, the 1for1 cheap removal game is viable at least. Shattering Spree is probably the best in that vein, since it can be, but isn't limited to being a 1for1. As a passive observer, it does seem that blunting, and finally taking apart their board with spot removal is viable.
Ancient Grudge bears a mention here.