One look at Furnace Celebration, and I was off to the races; paired with Ashnod’s Altar, it becomes a machine gun. Dave mentioned Goblins, and not only are they red, they have the right kinds of additional powers. Throw in Boggart Shenanigans so that every sacrifice does more. A single Goblin Grenade, with two additional mana, can turn into 8 damage. With an 18/11/10/0/1 mana curve, this stays at a low 1.88 average that will no doubt frustrate Dave. I may need to find a way to draw more cards, though, as this is potentially so cheap that I could have problems finishing the kill.