Try using flash on any multi hitter with assassin pyro soldier for the perfect hits to trigger flashes burns. Also if you have nightmare talisman use them on the same team as the pyro soldier, they also need perfect hits to trigger sleep.

I am using phantom Eddie with nightmare/necropolis for sleep/reduce max HP. Storm Eddie would work.
Madam for sleep skill with any talis
Sekmet with nightmare/Necropolis. Any multi hitter will work.
Assassin pyro soldier for the perfect t hit passive, gunner desert marauder.

After 80 runs on LoL X, I am done with max HP down, getting about 12 blinding burns per battle and about 9 sleeps per battle. If you run powerslave or AMoLoD you could get more per battle.