better mob heads

/summon MinecartCommandBlock ~ ~1 ~ {Command:kill @e[type=MinecartCommandBlock,r=1],Riding:{id:MinecartCommandBlock,Command:setblock ~ ~-1 ~1 redstone_block,Riding:{id:MinecartCommandBlock,Command:setblock ~ ~ ~1 command_block 0 replace {Command:fill ~ ~-3 ~-1 ~ ~ ~ air},Riding:{id:MinecartCommandBlock,Command:"scoreboard objectives add withert dummy",Riding:{id:MinecartCommandBlock,Command:"scoreboard objectives add creepert dummy",Riding:{id:MinecartCommandBlock,Command:"scoreboard objectives add skeletont dummy",Riding:{id:MinecartCommandBlock,Command:"scoreboard objectives add zombiet dummy",Riding:{id:MinecartCommandBlock,Command:"scoreboard teams add wither",Riding:{id:MinecartCommandBlock,Command:"scoreboard teams add creeper",Riding:{id:MinecartCommandBlock,Command:"scoreboard teams add skeleton",Riding:{id:MinecartCommandBlock,Command:"scoreboard teams add zombie",Riding:{id:MinecartCommandBlock,Command:blockdata ~3 ~-2 ~-1 {Command:"scoreboard players set @e zombiet 0"},Riding:{id:MinecartCommandBlock,Command:blockdata ~3 ~-2 ~1 {Command:"scoreboard players set @e skeletont 0"},Riding:{id:MinecartCommandBlock,Command:blockdata ~4 ~-2 ~-1 {Command:"scoreboard players set @e creepert 0"},Riding:{id:MinecartCommandBlock,Command:blockdata ~4 ~-2 ~1 {Command:"scoreboard players set @e withert 0"},Riding:{id:MinecartCommandBlock,Command:blockdata ~5 ~-2 ~-1 {Command:"scoreboard players set @a zombiet 1 {Inventory:[{Slot:103b,id:\\\"minecraft:skull\\\",Damage:2s}]}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~5 ~-2 ~1 {Command:"scoreboard players set @a skeletont 1 {Inventory:[{Slot:103b,id:\\\"minecraft:skull\\\",Damage:0s}]}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~6 ~-2 ~-1 {Command:"scoreboard players set @a creepert 1 {Inventory:[{Slot:103b,id:\\\"minecraft:skull\\\",Damage:4s}]}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~6 ~-2 ~1 {Command:"scoreboard players set @a withert 1 {Inventory:[{Slot:103b,id:\\\"minecraft:skull\\\",Damage:1s}]}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~7 ~-2 ~-1 {Command:"scoreboard players set @e zombiet 1 {ArmorItems:[{id:\\\"minecraft:skull\\\",Damage:2s}]}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~7 ~-2 ~1 {Command:"scoreboard players set @e skeletont 1 {ArmorItems:[{id:\\\"minecraft:skull\\\",Damage:0s}]}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~8 ~-2 ~-1 {Command:"scoreboard players set @e creepert 1 {ArmorItems:[{id:\\\"minecraft:skull\\\",Damage:4s}]}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~8 ~-2 ~1 {Command:"scoreboard players set @e withert 1 {ArmorItems:[{id:\\\"minecraft:skull\\\",Damage:1s}]}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~9 ~-2 ~-1 {Command:"scoreboard players set @e[type=Zombie] zombiet 1"},Riding:{id:MinecartCommandBlock,Command:blockdata ~9 ~-2 ~1 {Command:"scoreboard players set @e[type=Skeleton] skeletont 1"},Riding:{id:MinecartCommandBlock,Command:blockdata ~10 ~-2 ~-1 {Command:"scoreboard players set @e[type=Creeper] creepert 1"},Riding:{id:MinecartCommandBlock,Command:blockdata ~10 ~-2 ~1 {Command:"scoreboard players set @e[type=Skeleton] withert 1 {SkeletonType:1b}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~11 ~-2 ~-1 {Command:"scoreboard teams leave @e"},Riding:{id:MinecartCommandBlock,Command:blockdata ~11 ~-2 ~1 {Command:"scoreboard teams join zombie @e[score_zombiet_min=1]"},Riding:{id:MinecartCommandBlock,Command:blockdata ~12 ~-2 ~-1 {Command:"scoreboard teams join skeleton @e[score_skeletont_min=1]"},Riding:{id:MinecartCommandBlock,Command:blockdata ~12 ~-2 ~1 {Command:"scoreboard teams join creeper @e[score_creepert_min=1]"},Riding:{id:MinecartCommandBlock,Command:blockdata ~13 ~-2 ~-1 {Command:"scoreboard teams join wither @e[score_withert_min=1]"},Riding:{id:MinecartCommandBlock,Command:setblock ~2 ~-2 ~ redstone_block,Riding:{id:MinecartCommandBlock,Command:blockdata ~2 ~-2 ~-1 {Command:fill ~ ~ ~1 ~11 ~ ~1 stone},Riding:{id:MinecartCommandBlock,Command:blockdata ~2 ~-2 ~1 {Command:fill ~ ~ ~-1 ~11 ~ ~-1 redstone_block},Riding:{id:MinecartCommandBlock,Command:fill ~2 ~-2 ~-1 ~13 ~-2 ~-1 command_block,Riding:{id:MinecartCommandBlock,Command:fill ~2 ~-2 ~1 ~12 ~-2 ~1 command_block,Riding:{id:MinecartCommandBlock,Command:gamerule commandBlockOutput false,Riding:{id:MinecartCommandBlock,Riding:{id:FallingSand,Block:activator_rail,Time:1,Riding:{id:FallingSand,Block:redstone_block,Time:1,Riding:{id:FallingSand,Block:stone,Time:1}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}