The Headless Horseman

+2: summon two jack-o-lantern 1/1 token creatures with defend.
-5: sacrifice all jack-o-lantern token creatures and create X 2/2 flaming pumpkin heads with haste, where X is the number of pumpkins sacrificed.
-10: sacrifice The Headless Horseman and create a X/X pumpkin beast, where X is the cumulative power and toughness of all creatures on battlefield.