Small : Drying Sponges 1.9+

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:setblock ~6 ~-2 ~ chain_command_block 1 replace {auto:1,Command:"kill @e[type=ArmorStand,name=spongewet]"}},{id:MinecartCommandBlock,Command:setblock ~5 ~-2 ~ chain_command_block 5 replace {auto:1,Command:"execute @e[type=ArmorStand,name=spongewet] ~ ~ ~ detect ~ ~-1 ~ sponge 1 fill ~ ~-1 ~ ~ ~-1 ~ sponge 0 replace sponge 1"}},{id:MinecartCommandBlock,Command:setblock ~4 ~-2 ~ chain_command_block 5 replace {auto:1,Command:"execute @a ~ ~ ~ spreadplayers ~ ~ 1 50 false @e[type=ArmorStand,name=spongewet]"}},{id:MinecartCommandBlock,Command:setblock ~3 ~-2 ~ repeating_command_block 5 replace {auto:1,Command:"execute @a ~ ~ ~ summon ArmorStand ~ 255 ~ {Marker:true,Invisible:true,CustomName:spongewet}"}},{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]}]}]}]}