So did the math on this and actually Breakthrough does work as Brainfreeze 5-8. Since Breakthrough puts 4 cards in the grave and only costs 1 it pays for itself and add 1 extra card to the grave. After casting it 3 times, you have enough cards to exile to cast LED and repeat the process. Do this enough until you find Brainfreeze to put a whole bunch of cards in your grave and then just loop Lightning Bolts FTW.

