This is the same basic premise as Ice Chips, but for damage instead of grinding. It might benefit by Chandra’s Spitfire, but for now I will leave that out. The majority of creatures (28) have defender, but there is very little that can block flying (1 card). There is plenty of direct damage from instants and sorceries, including the Blasphemous Act reset button if needed (best if I can fire it off, then place Last-Ditch Effort atop it on the stack). A number of the walls (5) are pumpable, and that could be increased. Vent Sentinel is the key here, able to deal damage equal to the number of creatures with defender that I control. The curve is 8/10/14/6/0/0/0/0/2 for a 2.80 average, but it is only 2.35 without Blasphemous Act, which will cost far less than 9.