My only suggestion is Furnace of Rath . It is an instant kill to the whole table and if you have lifelink on your general you don't die.
Mmm love me some Furnace. I actually thought it was in there I must have missed it hah thanks
Not a bad deck, very pricey and creature light in my opinion. Being so creature light I would expect more board sweeps or "control" effects. It also seems a bit reliant on Heartless for the win which can be a problem if someone casts a Spell Crumple or Terminus .
Come check out my Heartless Hidetsugu / Ashling the Pilgrim Burn Deck (I switch between the two as generals from time to time).