summon FallingSand ~ ~1 ~ {Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{ TileEntityData:{Command:gamerule commandBlockOutput false},id:FallingSand,Block:command_block,Time:1}, id:FallingSand,Block:redstone_block,Time:1}, TileEntityData:{Command:gamerule logAdminCommands false},id:FallingSand,Block:command_block,Time:1}, TileEntityData:{Command:fill ~1 ~-4 ~-2 ~16 ~6 ~2 air},id:FallingSand,Block:command_blo