1 - /execute @e[type=Snowball,c=-6] ~ ~ ~ setblock 148 56 150 minecraft:redstone_block

2 - PARTICULAS: /particle cloud ~ ~0.4 ~ 0.1 0.1 0.1 0.2 100 @e[type=Zombie]w

3 - Bola de nieve /execute @e[type=Zombie] ~ ~ ~ summon Item ~ ~2 ~ {Item:{id:332,Damage:0,Count:1,tag:{display:{Name:PokeZombie}}}}

4 - execute @e[type=Snowball,c=-1] ~ ~ ~ /summon Zombie ~ ~2 ~