/summon FallingSand ~ ~1 ~ {Block:stone,Time:1,Passengers:[{id:FallingSand,Block:redstone_block,Time:1,Passengers:[{id:FallingSand,Block:activator_rail,Time:1,Passengers:[{id:MinecartCommandBlock,Command:gamerule commandBlockOutput false},{id:MinecartCommandBlock,Command:"/scoreboard objectives add potion dummy"},{id:MinecartCommandBlock,Command:"/scoreboard objectives add ground dummy"},{id:MinecartCommandBlock,Command:setblock ~4 ~-1 ~-1 chain_command_block 4 replace {auto:1,Command:"/execute @e[type=Skeleton,score_potion_min=19,score_potion=19] ~ ~ ~ /entitydata @e[type=Arrow,score_ground=0,r=3] {Potion:\\\"minecraft:poison\\\"}"}},{id:MinecartCommandBlock,Command:setblock ~5 ~-1 ~-1 chain_command_block 4 replace {auto:1,Command:"/execute @e[type=Skeleton,score_potion_min=18,score_potion=18] ~ ~ ~ /entitydata @e[type=Arrow,score_ground=0,r=3] {Potion:\\\"minecraft:weakness\\\"}"}},{id:MinecartCommandBlock,Command:setblock ~6 ~-1 ~-1 chain_command_block 4 replace {auto:1,Command:"/execute @e[type=Skeleton,score_potion_min=16,score_potion=16] ~ ~ ~ /entitydata @e[type=Arrow,score_ground=0,r=3] {Potion:\\\"minecraft:night_vision\\\"}"}},{id:MinecartCommandBlock,Command:setblock ~7 ~-1 ~-1 chain_command_block 4 replace {auto:1,Command:"/execute @e[type=Skeleton,score_potion_min=14,score_potion=14] ~ ~ ~ /entitydata @e[type=Arrow,score_ground=0,r=3] {Potion:\\\"minecraft:invisibility\\\"}"}},{id:MinecartCommandBlock,Command:setblock ~7 ~-1 ~ chain_command_block 2 replace {auto:1,Command:"/execute @e[type=Skeleton,score_potion_min=13,score_potion=13] ~ ~ ~ /entitydata @e[type=Arrow,score_ground=0,r=3] {Potion:\\\"minecraft:water_breathing\\\"}"}},{id:MinecartCommandBlock,Command:setblock ~6 ~-1 ~ chain_command_block 5 replace {auto:1,Command:"/execute @e[type=Skeleton,score_potion_min=12,score_potion=12] ~ ~ ~ /entitydata @e[type=Arrow,score_ground=0,r=3] {Potion:\\\"minecraft:fire_resistance\\\"}"}},{id:MinecartCommandBlock,Command:setblock ~5 ~-1 ~ chain_command_block 5 replace {auto:1,Command:"/execute @e[type=Skeleton,score_potion_min=10,score_potion=10] ~ ~ ~ /entitydata @e[type=Arrow,score_ground=0,r=3] {Potion:\\\"minecraft:regeneration\\\"}"}},{id:MinecartCommandBlock,Command:setblock ~4 ~-1 ~ chain_command_block 5 replace {auto:1,Command:"/execute @e[type=Skeleton,score_potion_min=8,score_potion=8] ~ ~ ~ /entitydata @e[type=Arrow,score_ground=0,r=3] {Potion:\\\"minecraft:leaping\\\"}"}},{id:MinecartCommandBlock,Command:setblock ~3 ~-1 ~ chain_command_block 5 replace {auto:1,Command:"/execute @e[type=Skeleton,score_potion_min=7,score_potion=7] ~ ~ ~ /entitydata @e[type=Arrow,score_ground=0,r=3] {Potion:\\\"minecraft:harming\\\"}"}},{id:MinecartCommandBlock,Command:setblock ~3 ~-1 ~1 chain_command_block 2 replace {auto:1,Command:"/execute @e[type=Skeleton,score_potion_min=6,score_potion=6] ~ ~ ~ /entitydata @e[type=Arrow,score_ground=0,r=3] {Potion:\\\"minecraft:healing\\\"}"}},{id:MinecartCommandBlock,Command:setblock ~4 ~-1 ~1 chain_command_block 4 replace {auto:1,Command:"/execute @e[type=Skeleton,score_potion_min=5,score_potion=5] ~ ~ ~ /entitydata @e[type=Arrow,score_ground=0,r=3] {Potion:\\\"minecraft:strength\\\"}"}},{id:MinecartCommandBlock,Command:setblock ~5 ~-1 ~1 chain_command_block 4 replace {auto:1,Command:"/execute @e[type=Skeleton,score_potion_min=2,score_potion=2] ~ ~ ~ /entitydata @e[type=Arrow,score_ground=0,r=3] {Potion:\\\"minecraft:slowness\\\"}"}},{id:MinecartCommandBlock,Command:setblock ~6 ~-1 ~1 chain_command_block 4 replace {auto:1,Command:"/execute @e[type=Skeleton,score_potion_min=1,score_potion=1] ~ ~ ~ /entitydata @e[type=Arrow,score_ground=0,r=3] {Potion:\\\"minecraft:swiftness\\\"}"}},{id:MinecartCommandBlock,Command:setblock ~7 ~-1 ~1 chain_command_block 4 replace {auto:1,Command:"/scoreboard players set @e[type=Arrow] ground 1 {inGround:1b}"}},{id:MinecartCommandBlock,Command:setblock ~7 ~-2 ~1 chain_command_block 1 replace {auto:1,Command:"/scoreboard players set @e[type=Arrow] ground 0 {inGround:0b}"}},{id:MinecartCommandBlock,Command:setblock ~6 ~-2 ~1 chain_command_block 5 replace {auto:1,Command:"/scoreboard players set @e[type=Skeleton] potion 19 {ActiveEffects:[{Id:19b}]}"}},{id:MinecartCommandBlock,Command:setblock ~5 ~-2 ~1 chain_command_block 5 replace {auto:1,Command:"/scoreboard players set @e[type=Skeleton] potion 18 {ActiveEffects:[{Id:18b}]}"}},{id:MinecartCommandBlock,Command:setblock ~4 ~-2 ~1 chain_command_block 5 replace {auto:1,Command:"/scoreboard players set @e[type=Skeleton] potion 16 {ActiveEffects:[{Id:16b}]}"}},{id:MinecartCommandBlock,Command:setblock ~3 ~-2 ~1 chain_command_block 5 replace {auto:1,Command:"/scoreboard players set @e[type=Skeleton] potion 14 {ActiveEffects:[{Id:14b}]}"}},{id:MinecartCommandBlock,Command:setblock ~3 ~-2 ~ chain_command_block 3 replace {auto:1,Command:"/scoreboard players set @e[type=Skeleton] potion 13 {ActiveEffects:[{Id:13b}]}"}},{id:MinecartCommandBlock,Command:setblock ~4 ~-2 ~ chain_command_block 4 replace {auto:1,Command:"/scoreboard players set @e[type=Skeleton] potion 12 {ActiveEffects:[{Id:12b}]}"}},{id:MinecartCommandBlock,Command:setblock ~5 ~-2 ~ chain_command_block 4 replace {auto:1,Command:"/scoreboard players set @e[type=Skeleton] potion 10 {ActiveEffects:[{Id:10b}]}"}},{id:MinecartCommandBlock,Command:setblock ~6 ~-2 ~ chain_command_block 4 replace {auto:1,Command:"/scoreboard players set @e[type=Skeleton] potion 8 {ActiveEffects:[{Id:8b}]}"}},{id:MinecartCommandBlock,Command:setblock ~7 ~-2 ~ chain_command_block 4 replace {auto:1,Command:"/scoreboard players set @e[type=Skeleton] potion 7 {ActiveEffects:[{Id:7b}]}"}},{id:MinecartCommandBlock,Command:setblock ~7 ~-2 ~-1 chain_command_block 3 replace {auto:1,Command:"/scoreboard players set @e[type=Skeleton] potion 6 {ActiveEffects:[{Id:6b}]}"}},{id:MinecartCommandBlock,Command:setblock ~6 ~-2 ~-1 chain_command_block 5 replace {auto:1,Command:"/scoreboard players set @e[type=Skeleton] potion 5 {ActiveEffects:[{Id:5b}]}"}},{id:MinecartCommandBlock,Command:setblock ~5 ~-2 ~-1 chain_command_block 5 replace {auto:1,Command:"/scoreboard players set @e[type=Skeleton] potion 2 {ActiveEffects:[{Id:2b}]}"}},{id:MinecartCommandBlock,Command:setblock ~4 ~-2 ~-1 chain_command_block 5 replace {auto:1,Command:"/scoreboard players set @e[type=Skeleton] potion 1 {ActiveEffects:[{Id:1b}]}"}},{id:MinecartCommandBlock,Command:setblock ~3 ~-2 ~-1 repeating_command_block 5 replace {auto:1,Command:"/scoreboard players set @e[type=Skeleton] potion 0"}},{id:MinecartCommandBlock,Command:setblock ~ ~ ~1 command_block 0 replace {Command:fill ~ ~-3 ~-1 ~ ~ ~ air}},{id:MinecartCommandBlock,Command:setblock ~ ~-1 ~1 redstone_block},{id:MinecartCommandBlock,Command:kill @e[type=MinecartCommandBlock,r=1]}]}]}]}