snow grenades

--objectives--
/scoreboard objectives add holding dummy
/scoreboard objectives add snowtype dummy
/scoreboard objectives add timer dummy

--give command--
/give @p snowball 1 0 {display:{Name:"Snow Grenade"}}

--clock commands--
/scoreboard players add @e[type=Snowball] timer 1
/scoreboard players set @a holding 0
/scoreboard players set @a holding 1 {SelectedItem:{id:"minecraft:snowball",tag:{display:{Name:"Snow Grenade"}}}}
/execute @a[score_holding_min=1] ~ ~ ~ scoreboard players set @e[type=Snowball,score_timer=2,r=2] snowtype 1
/execute @e[type=Snowball,score_snowtype_min=1] ~ ~ ~ particle reddust ~ ~ ~ 0.1 0.1 0.1 0.1 1
/execute @e[type=Snowball,score_timer_min=13,score_snowtype_min=1] ~ ~ ~ summon Creeper ~ ~ ~ {Fuse:0s,ExplosionRadius:3,ActiveEffects:[Id:14,Amplifier:1,Duration:100]}