HACER EL RELOJ:
/fill ~-20 ~ ~-1 ~ ~ ~-1 redstone_block
/fill ~-20 ~ ~1 ~ ~ ~1 air

comandos para poner en el reloj:

/execute @e[name=Babe] ~ ~ ~ /particle smoke ~ ~ ~ 0 0 0 0 5
/execute @a ~ ~ ~ /entitydata @e[name=Babe] {Motion:[0.0,0.2,0.0]}
/execute @a ~ ~ ~ /entitydata @e[name=Babe] {Motion:[0.0,-0.2,0.0]}


TRUCO 1 CAÑON:

FOTO:http://prntscr.com/9xcge5

1: /summon Pig ~1 ~0.18 ~ {Saddle:1,Age:-9999,NoAI:1,HealF:5,Silent:1,ActiveEffects:[{Id:14,Amplifier:1,Duration:999999}],CustomName:Babe2}

2: /execute @a ~ ~ ~ /entitydata @e[name=Babe2,r=2] {NoAI:0}
   /execute @e[name=Babe2] ~ ~ ~ /particle cloud ~ ~1 ~ 0.2 0.2 0.2 0.2 100

3: /playsound random.explode @a 0 0 0 99999 1 1
   /execute @a ~ ~ ~ /entitydata @e[name=Babe2,r=2] {NoAI:0,Motion:[-9.0,1.9,0.0]}

3: /tp @a ~ ~0.2 ~

TRUCO 2 ASCENSOR

FOTO: http://prntscr.com/9xchg8

1: /summon Pig -547.597 56.6 -256.482 {Saddle:1,Age:-9999,NoAI:1,HealF:5,Silent:1,ActiveEffects:[{Id:14,Amplifier:1,Duration:999999}],CustomName:Babe,Invulnerable:1b}

2: /setblock -565 56 -273 air (COORDENADAS DEL MOTION: 0.2 )
   /entitydata @e[name=Babe] {NoAI:0}
   /playsound dig.snow @a 0 0 0 9999 2 1

3: /setblock -565 56 -273 minecraft:redstone_block (COORDENADAS MOTION: -0.2)
   /entitydata @e[name=Babe] {NoAI:1}

4: /entitydata @e[name=Babe] {NoAI:0}
   /playsound dig.snow @a 0 0 0 9999 0 1

5 /entitydata @e[name=Babe] {NoAI:1}